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CN119337644B - Radio astronomical electromagnetic environment simulation and construction method, system and computer equipment - Google Patents

Radio astronomical electromagnetic environment simulation and construction method, system and computer equipment Download PDF

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Publication number
CN119337644B
CN119337644B CN202411886020.3A CN202411886020A CN119337644B CN 119337644 B CN119337644 B CN 119337644B CN 202411886020 A CN202411886020 A CN 202411886020A CN 119337644 B CN119337644 B CN 119337644B
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simulation
signal
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environment simulation
radio
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CN119337644A (en
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袁英俊
陈中悦
张文广
刘贯领
王钰
张晓航
段然
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Zhejiang Lab
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Zhejiang Lab
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    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
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    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
    • G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/06—Power analysis or power optimisation
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract

The application relates to a radio astronomical electromagnetic environment simulation and construction method, a system and computer equipment, which are applied to a radio astronomical electromagnetic environment simulation system; the method comprises the steps of determining a target simulation mode corresponding to a target environment simulation mode according to a preset corresponding relation, simulating according to the target simulation mode based on electromagnetic environment simulation parameters, determining a target radio-frequency interference signal corresponding to the target environment simulation mode, obtaining the target radio-frequency interference signal determined according to the electromagnetic environment simulation parameters, performing superposition processing on the target radio-frequency interference signal and the target radio-frequency interference signal to obtain a target environment simulation signal, constructing a radio-astronomical electromagnetic environment according to the target environment simulation signal, realizing the high reduction of the complex radio-astronomical electromagnetic environment, and improving the flexibility and the adaptability of the radio-astronomical electromagnetic environment simulation and construction.

Description

Radio astronomical electromagnetic environment simulation and construction method, system and computer equipment
Technical Field
The application relates to the technical field of signal simulation, in particular to a radio astronomical electromagnetic environment simulation and construction method, a system and computer equipment.
Background
In recent years, a plurality of large-scale radio telescope systems are established internationally, and the radio telescope systems are composed of a receiving array formed by a plurality of antennas, a multichannel receiving and collecting system and a back-end signal processing system. Radio telescope systems usually need to be subjected to strict test and long-term debugging in complex and diverse electromagnetic environments to optimize functions, but there are limitations in debugging and testing depending on actual environments, such as single test environment, multiple uncontrollable factors, long debugging period, etc. To overcome the above problems, the prior art generally relies on various types of special signal generators to combine to simulate an electromagnetic environment.
However, the related art has problems in that simulation of a radio astronomical signal of a specified type is impossible and a corresponding electromagnetic environment cannot be flexibly constructed.
Disclosure of Invention
Based on the above, it is necessary to provide a method, a system and a computer device for simulating and constructing a radioastronomical electromagnetic environment.
In a first aspect, the present application provides a method for simulating and constructing a radioastronomical electromagnetic environment, applied to a radioastronomical electromagnetic environment simulation system, the method comprising:
acquiring electromagnetic environment simulation parameters and a target environment simulation mode, wherein the target environment simulation mode at least comprises any one of a plurality of environment simulation modes;
Determining a target simulation mode corresponding to the target environment simulation mode according to a preset corresponding relation, wherein the preset corresponding relation comprises a corresponding relation between the environment simulation mode and the simulation mode;
Based on the electromagnetic environment simulation parameters, simulating according to the target simulation mode, and determining a target radio astronomical signal corresponding to the target environment simulation mode;
acquiring a target radio frequency interference signal determined according to the electromagnetic environment simulation parameters;
Superposing the target radio astronomical signal and the target radio frequency interference signal to obtain a target environment simulation signal;
And constructing the radio astronomical electromagnetic environment according to the target environment simulation signal.
In one embodiment, the electromagnetic environment simulation parameters include simulation center frequency, sampling frequency, simulation duration, radio astronomical signal simulation parameters and radio frequency interference simulation parameters, the environment simulation modes include a rapid radio storm electromagnetic environment simulation mode, a neutral hydrogen electromagnetic environment simulation mode and a pulsar electromagnetic environment simulation mode, the simulation is performed according to the target simulation mode based on the electromagnetic environment simulation parameters, and the determining of the target radio astronomical signal corresponding to the target environment simulation mode includes:
Under the condition that the target environment simulation mode is a rapid-shooting-storm electromagnetic environment simulation mode, simulating according to a rapid-shooting-storm signal simulation mode based on the electromagnetic environment simulation parameters to obtain a target rapid-shooting-storm signal;
under the condition that the target environment simulation mode is a neutral hydrogen electromagnetic environment simulation mode, simulating according to a neutral hydrogen signal simulation mode based on the electromagnetic environment simulation parameters to obtain a target neutral hydrogen signal;
and under the condition that the target environment simulation mode is a pulsar electromagnetic environment simulation mode, simulating according to a pulsar signal simulation mode based on the electromagnetic environment simulation parameters to obtain a target pulsar signal.
In one embodiment, the simulating, based on the electromagnetic environment simulation parameter, according to a fast radio storm signal simulation mode to obtain a target fast radio storm signal includes:
Acquiring a first simulation parameter corresponding to a rapid radio storm signal, wherein the first simulation parameter comprises signal center frequency, bandwidth, pulse full width at half maximum and dispersion quantity;
Generating a first pulse envelope and a first baseband signal according to the first simulation parameters;
Generating a first intermediate signal from the first pulse envelope and the first baseband signal;
Performing dispersion simulation on the first intermediate signal to obtain an initial rapid radio storm signal;
And according to the electromagnetic environment simulation parameters, carrying out noise adding processing on the initial rapid radio storm signal to obtain a target rapid radio storm signal.
In one embodiment, the simulating according to the neutral hydrogen signal simulation mode based on the electromagnetic environment simulation parameter to obtain the target neutral hydrogen signal includes:
obtaining a simulation type and a second simulation parameter corresponding to the neutral hydrogen signal, wherein the second simulation parameter comprises Doppler speed and relative acceleration;
Generating a neutral hydrogen emission line signal according to the second simulation parameter when the simulation type is a neutral hydrogen emission line signal;
Under the condition that the simulation type is a neutral hydrogen absorption line signal, determining a target filter according to the simulation center frequency, the second simulation parameter and a preset filter parameter;
acquiring Gaussian white noise, and taking the Gaussian white noise as target background noise;
Filtering the target background noise through the target filter to obtain a neutral hydrogen absorption line signal;
And according to the electromagnetic environment simulation parameters, carrying out noise adding treatment on the neutral hydrogen emission line signal or the neutral hydrogen absorption line signal to obtain a target neutral hydrogen signal.
In one embodiment, the preset filter parameters include a stop band attenuation value, and the determining the target filter according to the simulation center frequency, the second simulation parameter and the preset filter parameters includes:
Obtaining a neutral hydrogen relative frequency position according to the simulation center frequency and the second simulation parameter, wherein the neutral hydrogen relative frequency position comprises a signal starting frequency and a signal cut-off frequency;
Generating a stop band frequency and a pass band frequency according to the signal starting frequency and the signal cut-off frequency;
And determining a target filter according to the stop band frequency, the pass band frequency and the stop band attenuation value, wherein the target filter is a high-pass filter.
In one embodiment, the simulating according to the pulsar signal simulation mode based on the electromagnetic environment simulation parameter to obtain the target pulsar signal includes:
Acquiring a third simulation parameter corresponding to the pulsar signal;
Generating a second pulse envelope and a second baseband signal according to the third analog parameter, wherein the second pulse envelope comprises a single-peak pulse, a multi-peak pulse, a micro pulse and a macro pulse;
Generating a second intermediate signal from the second pulse envelope and the second baseband signal;
performing dispersion simulation on the second intermediate signal to obtain an initial pulsar signal;
And carrying out noise adding processing on the initial pulsar signal according to the electromagnetic environment simulation parameters to obtain a target pulsar signal.
In one embodiment, the electromagnetic environment simulation parameters include a simulation center frequency, a sampling frequency, a simulation duration, a radio astronomical signal simulation parameter and a radio frequency interference simulation parameter, the target radio frequency interference signal includes a broadband radio frequency interference signal, and the acquiring the target radio frequency interference signal determined according to the electromagnetic environment simulation parameter includes:
Acquiring a fourth simulation parameter corresponding to the broadband radio frequency interference signal;
Generating a third pulse envelope and a third baseband signal according to the fourth simulation parameter;
Generating single carrier pulse interference according to the simulation center frequency, a first target parameter in the fourth simulation parameter and the third pulse envelope, wherein the first target parameter comprises pulse center frequency and pulse full width at half maximum;
Generating random noise pulse interference according to the simulation center frequency, a second target parameter in the fourth simulation parameter, the third pulse envelope and the third baseband signal, wherein the second target parameter comprises bandwidth and pulse full width at half maximum;
Generating chirp pulse interference according to the simulation center frequency, a third target parameter in the fourth simulation parameters and the third pulse envelope, wherein the third target parameter comprises pulse center frequency, bandwidth and pulse full width at half maximum;
And determining a target radio frequency interference signal from the single carrier pulse interference, the random noise pulse interference and the linear frequency modulation pulse interference according to the electromagnetic environment simulation parameters.
In one embodiment, the constructing the radioastronomical electromagnetic environment according to the target environment simulation signal includes:
Performing fixed-point quantization processing on the target environment simulation signal to obtain a quantized environment simulation signal;
transmitting the quantized environment simulation signal to a target software radio transmission platform;
and constructing the radio astronomical electromagnetic environment based on the target software radio transmission platform and the quantized environment simulation signal.
In a second aspect, the present application further provides a radio astronomical electromagnetic environment simulation and construction device, where the device includes:
The system comprises an acquisition module, a target environment simulation module and a control module, wherein the acquisition module is used for acquiring electromagnetic environment simulation parameters and a target environment simulation mode, and the target environment simulation mode at least comprises any one of a plurality of environment simulation modes;
the simulation mode determining module is used for determining a target simulation mode corresponding to the target environment simulation mode according to a preset corresponding relation, wherein the preset corresponding relation comprises a corresponding relation between the environment simulation mode and the simulation mode;
The radio astronomical signal determining module is used for simulating according to the target simulation mode based on the electromagnetic environment simulation parameters to determine a target radio astronomical signal corresponding to the target environment simulation mode;
the radio frequency interference signal acquisition module is used for acquiring a target radio frequency interference signal determined according to the electromagnetic environment simulation parameters;
The processing module is used for carrying out superposition processing on the target radio astronomical signal and the target radio frequency interference signal to obtain a target environment simulation signal;
And constructing an electromagnetic environment, namely constructing the radio astronomical electromagnetic environment according to the target environment simulation signal.
In a third aspect, the application also provides a radio astronomical electromagnetic environment simulation system, which comprises a radio astronomical electromagnetic environment simulation platform and a target software radio transmission platform, wherein the radio astronomical electromagnetic environment simulation platform is in communication connection with the target software radio transmission platform;
The radio astronomical electromagnetic environment simulation platform is used for acquiring electromagnetic environment simulation parameters and a target environment simulation mode, wherein the target environment simulation mode at least comprises any one of a plurality of environment simulation modes, a target simulation mode corresponding to the target environment simulation mode is determined according to a preset corresponding relation, the preset corresponding relation comprises a corresponding relation between the environment simulation mode and the simulation mode, simulation is carried out according to the target simulation mode based on the electromagnetic environment simulation parameters, a target radio astronomical signal corresponding to the target environment simulation mode is determined, a target radio frequency interference signal determined according to the electromagnetic environment simulation parameters is acquired, and the target radio frequency interference signal are subjected to superposition processing to obtain a target environment simulation signal;
The target software radio transmitting platform is used for constructing a radio astronomical electromagnetic environment according to the target environment simulation signal.
In a fourth aspect, the present application also provides a computer device comprising a memory storing a computer program and a processor implementing the steps of the method according to any one of the embodiments of the first aspect when the processor executes the computer program.
In a fifth aspect, the present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the steps of the method described in any of the embodiments of the first aspect above.
In a sixth aspect, the present application also provides a computer program product comprising a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the method described in any of the embodiments of the first aspect.
The method, the system and the computer equipment for simulating and constructing the radio astronomical electromagnetic environment are applied to a radio astronomical electromagnetic environment simulation system, the basic consistency of a generated target environment simulation signal and an actually observed radio astronomical signal can be ensured by acquiring electromagnetic environment simulation parameters and target environment simulation modes, wherein the target environment simulation modes at least comprise any one of a plurality of environment simulation modes, further, the target simulation modes corresponding to the target environment simulation modes are determined according to preset corresponding relations, the preset corresponding relations comprise the corresponding relations between the environment simulation modes and the simulation modes, simulation is carried out according to the target simulation modes based on electromagnetic environment simulation parameters, the target radio astronomical signal corresponding to the target environment simulation modes is determined, the most suitable simulation mode can be automatically selected according to different target environment simulation modes based on the preset corresponding relations to generate a corresponding target radio astronomical signal, the basis is provided for enhancing the flexibility and the adaptability of the radio astronomical electromagnetic environment simulation, further, the target radio frequency interference signals determined according to the electromagnetic environment simulation parameters are acquired, the target radio frequency interference signals corresponding to the target environment simulation modes are determined according to the preset corresponding relations, the electromagnetic environment simulation signals can be accurately restored according to the electromagnetic environment simulation signals, the fact that the electromagnetic environment simulation environment cannot be accurately restored to the actual environment is realized, and the electromagnetic environment cannot be accurately is prevented from being influenced by the electromagnetic environment simulation signals corresponding to the actual environment, and the electromagnetic environment can be accurately restored according to the electromagnetic environment simulation environment, the problem of low simulation and construction flexibility of the radio astronomical electromagnetic environment is caused, and the simulation and construction flexibility and adaptability of the radio astronomical electromagnetic environment are improved.
Drawings
FIG. 1 is an application environment diagram of a radio astronomical electromagnetic environment simulation and construction method in one embodiment;
FIG. 2 is a flow diagram of a method for simulating and constructing a radio astronomical electromagnetic environment in one embodiment;
FIG. 3 is a flow chart illustrating a fast-shot-storm signal simulation step in one embodiment;
FIG. 4 is a schematic diagram of a simulation process of a target fast-shot storm signal according to an embodiment;
FIG. 5 is a time-frequency diagram of a first intermediate signal and an initial fast-shot signal in one embodiment;
FIG. 6 is a flow diagram of a neutral hydrogen signal simulation step in one embodiment;
FIG. 7 is a schematic diagram of a neutral hydrogen signal power spectrum in one embodiment;
FIG. 8 is a flow chart of a pulsar signal simulation step in one embodiment;
FIG. 9 is a time domain frequency domain waveform diagram of a second intermediate signal according to the first embodiment;
FIG. 10 is a time domain frequency domain waveform diagram of a second intermediate signal according to a second embodiment;
FIG. 11 is a time domain frequency domain waveform diagram of a second intermediate signal according to a third embodiment;
FIG. 12 is a flowchart illustrating a target RF interference signal simulation step in one embodiment;
FIG. 13 is a time domain frequency domain waveform diagram of single carrier pulse interference in an embodiment;
FIG. 14 is a time domain frequency domain waveform diagram of random noise impulse interference in an embodiment;
FIG. 15 is a time domain frequency domain waveform of linear FM pulse interference according to one embodiment;
FIG. 16 is a schematic diagram of a radio astronomical electromagnetic environment simulation system in one embodiment;
FIG. 17 is a block diagram of a radio astronomical electromagnetic environment simulation device in one embodiment;
fig. 18 is an internal structural view of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The radio astronomical electromagnetic environment simulation and construction method provided by the embodiment of the application can be applied to an application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104 or may be located on a cloud or other network server. The terminal 102 may be, but is not limited to, various personal computers, notebook computers, tablet computers, and internet of things devices. The server 104 may be an independent physical server, a server cluster or a distributed system formed by a plurality of physical servers, or a cloud server providing cloud computing services.
In an exemplary embodiment, as shown in fig. 2, fig. 2 is a flow chart of a method for simulating and constructing a radio astronomical electromagnetic environment in one embodiment, where the method for simulating and constructing a radio astronomical electromagnetic environment is applied to a radio astronomical electromagnetic environment simulation system, and includes the following steps:
Step S201, acquiring electromagnetic environment simulation parameters and a target environment simulation mode.
The target environment simulation mode at least comprises any one of a plurality of environment simulation modes. The environmental simulation modes may include, but are not limited to, a fast-shot electromagnetic environment simulation mode, a neutral hydrogen electromagnetic environment simulation mode, and a pulsar electromagnetic environment simulation mode.
The radio astronomical electromagnetic environment simulation system comprises a radio astronomical electromagnetic environment simulation platform and a target software radio transmission platform, wherein the radio astronomical electromagnetic environment simulation platform is in communication connection with the target software radio transmission platform, the radio astronomical electromagnetic environment simulation platform can comprise a terminal and electromagnetic environment construction software, the radio astronomical electromagnetic environment simulation platform is used for generating a target environment simulation signal according to electromagnetic environment simulation parameters and a target environment simulation mode and transmitting the target environment simulation signal to the target software radio transmission platform, the radio astronomical electromagnetic environment simulation platform is also used for configuring the electromagnetic environment simulation parameters and the target environment simulation mode, the target software radio transmission platform can comprise software radio (Software Defined Radio, SDR) equipment and an antenna, and the target software radio transmission platform is used for constructing the radio astronomical electromagnetic environment according to the target environment simulation signal.
It should be noted that, limited by the transmitting capability of the software radio SDR device, when the radio astronomical electromagnetic environment simulation system works, electromagnetic environment simulation parameters and target environment simulation modes need to be configured in advance according to actual requirements.
The electromagnetic environment simulation parameters at least comprise simulation center frequency, sampling frequency, simulation duration, radio astronomical signal simulation parameters and radio frequency interference simulation parameters. The simulation center frequency is a reference frequency for radio astronomical signal simulation, and determines the simulated frequency band range and the working frequency band. It will be appreciated that selecting an appropriate simulation center frequency ensures that the simulated signal covers the primary frequency band of the celestial body of interest transmitting or receiving signals. It should be noted that the simulation center frequency needs to be set according to the performance of the software-defined radio SDR device, and is not specifically limited herein, for example, the simulation center frequency is FcMHz.
The sampling frequency refers to the number of times of discretization processing on continuous time signals in each second, namely the number of data points acquired in a certain time. The sampling frequency needs to be set based on the nyquist sampling theorem, and it needs to be ensured that the signal is not distorted, and is not specifically limited herein, for example, the sampling frequency is FsMHz.
The simulation duration refers to the duration of the simulation process. The simulation duration determines the time range covered by the simulation and the dynamic change process which can be simulated. The simulation duration is required to be set according to the actual simulation requirement, and is not particularly limited, for example, the single simulation duration is T seconds.
The radio astronomical signal simulation parameters are used for simulating different types of radio astronomical signals. The radio astronomical signal simulation parameters at least comprise a first simulation parameter corresponding to a rapid radio storm signal, a simulation type corresponding to a neutral hydrogen signal, a second simulation parameter and a third simulation parameter corresponding to a pulsar signal, wherein the first simulation parameter comprises signal center frequency, bandwidth, pulse full width at half maximum and dispersion quantity, the second simulation parameter comprises Doppler speed and relative acceleration, and the third simulation parameter comprises pulse number, relative amplitude, relative center position, signal center frequency, bandwidth, pulse full width at half maximum and dispersion quantity.
The radio frequency interference simulation parameters are used for simulating different types of radio frequency interference, for example, the radio frequency interference simulation parameters at least comprise fourth simulation parameters corresponding to broadband radio frequency interference signals, and the fourth simulation parameters comprise pulse full width at half maximum, pulse center frequency and bandwidth.
Step S202, determining a target simulation mode corresponding to the target environment simulation mode according to a preset corresponding relation.
The preset corresponding relation comprises a corresponding relation between an environment simulation mode and a simulation mode. It will be appreciated that there is a unique corresponding simulation mode for each environmental simulation mode.
It should be noted that, in the simulation mode, corresponding settings need to be performed according to time domain features and frequency domain features of different types of radio astronomical signals, so as to ensure that the corresponding types of radio astronomical signals can be accurately simulated.
The environment simulation modes comprise a rapid-injection storm electromagnetic environment simulation mode, a neutral hydrogen electromagnetic environment simulation mode and a pulsar electromagnetic environment simulation mode.
Among them, fast Radio Burst (FRB) is a short and intense Radio Burst event from deep in the universe, usually lasting from a few milliseconds to a few seconds. The fast radio storm electromagnetic environment simulation mode is used for simulating fast radio storm astronomical phenomena so as to evaluate the capability of the radio telescope system in the aspects of finding and analyzing fast radio storm signals.
The neutral hydrogen electromagnetic environment simulation mode is used for simulating a neutral hydrogen signal so as to evaluate the capability of the radio telescope system in the aspects of finding and analyzing the neutral hydrogen signal.
Among them pulsars, a class of fast rotating neutron satellites, whose strong magnetic field and high density enable them to emit periodic electromagnetic radiation. The pulsar electromagnetic environment simulation mode is used for simulating periodic pulsar signals so as to evaluate the capability of the radio telescope system for capturing and analyzing the pulsar signals.
Step S203, based on the electromagnetic environment simulation parameters, simulation is performed according to a target simulation mode, and a target radio astronomical signal corresponding to the target environment simulation mode is determined.
The target radio astronomical signal at least comprises any one of a target rapid radio storm signal, a target neutral hydrogen signal and a target pulsar signal.
Step S204, a target radio frequency interference signal determined according to the electromagnetic environment simulation parameters is obtained.
The target radio frequency interference signal is a key component for simulating various artificial and natural radio frequency interference sources possibly encountered in a real environment. The target radio frequency interference signal at least comprises a broadband radio frequency interference signal and a narrowband radio frequency interference signal. The narrowband radio frequency interference signal is the most easily-occurring interference on the ground, and the interference sources are wide, including but not limited to broadcasting, wireless communication and the like.
In radio astronomical observation, radio frequency interference (Radio Frequency Interference, RFI) is an important factor affecting observation data quality and scientific discovery. In particular, the long and short-time and wide-spectrum pulse-like broadband radio-frequency interference signals and the long-duration narrow-band interference signals have significant influence on the detection and identification of radio astronomical signals such as rapid radio storm signals and pulsar signals.
In one exemplary embodiment, generation of narrowband radio frequency interference signals is supported as a typical modulation signal, which may include, but is not limited to, AM (Amplitude Modulation ), CW (Continuous Wave), ASK (AmplitudeShift Keying, amplitude keying), BPSK (Binary PHASE SHIFT KEYING ).
Taking a narrowband RF interference signal as an example, the analog parameters corresponding to the narrowband RF interference signal are obtained, and the analog parameters can include, but are not limited to, modulation signal type, center frequencyThe bandwidth BW, the code rate R c, the start time T b, the signal duration T L, and the analog parameters need to be set according to the actual requirements, which are not limited herein. For CW modulation, a narrowband radio frequency interference signal is modeled as in equation (1).
(1)
For AM modulation, the narrowband radio frequency interference signal is modeled as in equation (2).
(2)
Wherein m (t) represents band-limited Gaussian noise with a bandwidth of BW; where N g (t) represents complex gaussian noise and Filter represents a low pass Filter.
For ASK modulation, the narrowband radio frequency interference signal is modeled as in equation (3).
(3)
Wherein g (t) is a rectangular shaped pulse,Is the symbol width.
For BPSK modulation, the narrowband radio frequency interference signal is modeled as in equation (4).
(4)
Wherein g (t) is a rectangular shaped pulse,Is the symbol width.
And step S205, performing superposition processing on the target radio astronomical signal and the target radio frequency interference signal to obtain a target environment simulation signal.
The method comprises the steps of obtaining an interference power coefficient, carrying out power adjustment on a target radio frequency interference signal according to the interference power coefficient to obtain an adjusted target radio frequency interference signal, and carrying out superposition processing on a target radio astronomical signal and the adjusted target radio frequency interference signal to obtain a target environment simulation signal. The interference power coefficient may be randomly generated by the interference power range or may be set by the user, and is not specifically limited herein.
And S206, constructing the radioastronomical electromagnetic environment according to the target environment simulation signal.
It can be understood that the target environment simulation signal can be obtained more truly and reliably by superposing the target radio astronomical signal and the target radio frequency interference signal, and then the target environment simulation signal is transmitted to the target software radio transmission platform, so that the simulation and construction of the radio astronomical electromagnetic environment can be realized.
According to the embodiment, the radio astronomical electromagnetic environment simulation and construction method is applied to a radio astronomical electromagnetic environment simulation system, the basic consistency of a generated target environment simulation signal and an actually observed radio astronomical signal can be ensured by acquiring electromagnetic environment simulation parameters and target environment simulation modes, further, a target simulation mode corresponding to the target environment simulation modes is determined according to a preset corresponding relation, simulation is carried out according to the electromagnetic environment simulation parameters and the target radio astronomical signal corresponding to the target environment simulation modes, the optimal simulation mode can be automatically selected according to different target environment simulation modes based on the preset corresponding relation to generate corresponding target radio astronomical signals, the foundation is laid for enhancing the flexibility and adaptability of the radio astronomical electromagnetic environment simulation, the accuracy of the target environment simulation signal is ensured to be close to the actual condition by acquiring the target radio frequency interference signal determined according to the electromagnetic environment simulation parameters and carrying out superposition processing on the target radio frequency interference signal, the accuracy of the target environment simulation signal is improved, the problem that the electromagnetic environment simulation environment cannot be constructed according to the target environment simulation modes is solved, and the electromagnetic environment simulation environment cannot be constructed with high flexibility and the electromagnetic environment simulation environment cannot be reduced.
In one embodiment, the environment simulation modes comprise a rapid radio storm electromagnetic environment simulation mode, a neutral hydrogen electromagnetic environment simulation mode and a pulsar electromagnetic environment simulation mode, simulation is carried out according to a target simulation mode based on electromagnetic environment simulation parameters, and a target radio astronomical signal corresponding to the target environment simulation mode is determined, and the method comprises the following steps:
Step 1, under the condition that the target environment simulation mode is a rapid-shooting-storm electromagnetic environment simulation mode, simulating according to a rapid-shooting-storm signal simulation mode based on electromagnetic environment simulation parameters to obtain a target rapid-shooting-storm signal.
The rapid-storm electromagnetic environment simulation mode is used for simulating rapid-storm astronomical phenomena so as to evaluate the capability of the radio telescope system in the aspects of finding and analyzing rapid-storm signals.
And 2, under the condition that the target environment simulation mode is a neutral hydrogen electromagnetic environment simulation mode, simulating according to a neutral hydrogen signal simulation mode based on electromagnetic environment simulation parameters to obtain a target neutral hydrogen signal.
The neutral hydrogen electromagnetic environment simulation mode is used for simulating a neutral hydrogen signal so as to evaluate the capability of the radio telescope system in the aspect of finding and analyzing the neutral hydrogen signal.
And step 3, under the condition that the target environment simulation mode is a pulsar electromagnetic environment simulation mode, simulating according to a pulsar signal simulation mode based on electromagnetic environment simulation parameters to obtain a target pulsar signal.
The pulsar electromagnetic environment simulation mode is used for simulating periodic pulsar signals so as to evaluate the capability of the radio telescope system for capturing and analyzing the pulsar signals.
In the embodiment, based on different target environment simulation modes, namely a rapid radio storm electromagnetic environment simulation mode, a neutral hydrogen electromagnetic environment simulation mode and a pulsar electromagnetic environment simulation mode, the method is beneficial to comprehensively checking the discovery capability of the radio telescope system on different types of radio astronomical signals, and further improves the flexibility and adaptability of radio astronomical electromagnetic environment simulation.
In one embodiment, as shown in fig. 3, fig. 3 is a flow chart of a rapid-storm signal simulation step in one embodiment, and based on electromagnetic environment simulation parameters, the simulation is performed according to a rapid-storm signal simulation mode to obtain a target rapid-storm signal, which comprises the following steps:
In step S301, a first analog parameter corresponding to the fast radio storm signal is obtained.
The first analog parameters comprise signal center frequency, bandwidth, full width at half maximum pulse and dispersion.
In an exemplary embodiment, the signal center frequency is f 0 MHz, the bandwidth is BWMHz, and the full width at half maximum pulse is FWHM seconds, wherein the first analog parameter may be generated in a random mode or set in a fixed mode, without limitation.
Step S302, a first pulse envelope and a first baseband signal are generated according to the first analog parameters.
Wherein the first pulse envelope has a gaussian profile. The first baseband signal is simulated by adopting zero intermediate frequency complex Gaussian band-limited noise. Illustratively, the first baseband signal is m (t), where m (t) represents band-limited Gaussian noise with a bandwidth of BW; where N g (t) represents complex gaussian noise and Filter represents a low pass Filter.
In one exemplary embodiment, the first pulse envelope is in gaussian form and is modeled according to equation (5).
(5)
Wherein A is amplitude, t is current time, t c is pulse center time,The starting point for obtaining the pulse profile is defined asThe end point isPulse widthIt should be noted that the relationship between the pulse width and the full width at half maximum of the gaussian pulse profile is applicable to all single gaussian pulses in the following embodiments, and will not be repeated.
Step S303, generating a first intermediate signal according to the first pulse envelope and the first baseband signal.
Illustratively, the first intermediate signal s (t) is generated according to equation (6) based on the first pulse envelope, the first baseband signal m (t), and the signal center frequency f 0 MHz in equation (5).
(6)
Step S304, performing dispersion simulation on the first intermediate signal to obtain an initial fast radio storm signal.
Illustratively, the electromagnetic environment simulation parameters include a simulation center frequency FcMHz, a sampling frequency FsMHz, and a simulation duration T seconds. When the first intermediate signal is subjected to dispersion simulation, a dispersion amount DM needs to be configured, wherein the dispersion amount DM can be randomly generated or fixedly configured, and the specific limitation is not limited herein. The interplanetary medium transfer function corresponding to the dispersion is shown in equation (7).
(7)
Where D is the interplanetary medium dispersion constant (4148.808 MHz 2pc-1cm3s）,f0 is the center frequency and f is the frequency relative to f 0.
Further, the first intermediate signal is subjected to dispersion simulation based on the interplanetary medium transfer function corresponding to the dispersion, i.e., formula (7). Specifically, the first intermediate signal s (t) is subjected to fast fourier transform FFT to obtain a signal spectrum s (f), and the dispersion effect simulation is shown in formula (8).
(8)
Further, toAnd performing Inverse Fast Fourier Transform (IFFT) to obtain an initial fast-storm signal, wherein the initial fast-storm signal is shown in formula (9).
(9)
Further optionally, for an initial fast-shot storm signalDown-converting to 0 frequency according to Fc, and carrying out power normalization treatment.
And step S305, according to the electromagnetic environment simulation parameters, the initial rapid radio storm signal is subjected to noise adding processing, and the target rapid radio storm signal is obtained.
Illustratively, the start time T b：0<Tb<T-TFRB is randomly generated according to the set simulation time period T seconds, and the initial fast-shot storm signal is generated according to the preset signal-to-noise ratioAdding Gaussian white noise (t) to obtain a target fast-shot storm signal s c (t) as shown in formula (10). Wherein T is greater than FRB pulse width T FRB.
(10)
In an exemplary embodiment, schematic diagrams of signals during simulation of a target fast-shot storm signal are shown in fig. 4 and 5. Wherein fig. 4 includes a first pulse envelope signal, a first baseband signal, a first intermediate signal, and a first intermediate signal spectrum. Fig. 5 includes a time-frequency plot of a first intermediate signal and a time-frequency plot of an initial fast-shot signal.
In the embodiment, a first pulse envelope and a first baseband signal are generated through first simulation parameters corresponding to the rapid electric storm signals, a first intermediate signal is further synthesized, dispersion simulation is conducted on the first intermediate signal to obtain initial rapid electric storm signals, basic consistency of the initial rapid electric storm signals in the aspects of frequency spectrum characteristics, time structures, propagation effects and the like and real conditions is guaranteed, reliable data bases are provided for researching the receiving and detecting of the rapid electric storm signals, further, noise processing is conducted on the initial rapid electric storm signals according to electromagnetic environment simulation parameters to generate target rapid electric storm signals, and simulation results are enabled to be closer to real electromagnetic environments through addition of noise conforming to actual observation conditions, so that accuracy and reliability of simulation of the target rapid electric storm signals are improved.
In one embodiment, as shown in fig. 6, fig. 6 is a flow chart of a neutral hydrogen signal simulation step in one embodiment, and based on electromagnetic environment simulation parameters, the simulation is performed according to a neutral hydrogen signal simulation mode to obtain a target neutral hydrogen signal, which comprises the following steps:
step S601, obtaining a simulation type and a second simulation parameter corresponding to the neutral hydrogen signal.
The neutral hydrogen signals in radio astronomical observation are two types, including a transmission line signal and an absorption line signal, and the frequency of the neutral hydrogen signals is. Since there is a high degree of motion between celestial bodies, and there is also relative motion of neutral hydrogen in the own celestial system, the neutral hydrogen signal is significantly affected by the doppler effect, including doppler shift due to relative radial motion velocity v (m/s) and line broadening due to relative acceleration v a (m/s 2).
Wherein the simulation type includes a neutral hydrogen emission line signal and a neutral hydrogen absorption line signal, and wherein the second simulation parameter includes Doppler velocity and relative acceleration.
In step S602, in the case where the simulation type is the neutral hydrogen emission line signal, the neutral hydrogen emission line signal is generated according to the second simulation parameter.
Illustratively, the electromagnetic environment simulation parameters include a simulation center frequency FcMHz, a sampling frequency FsMHz, and a simulation duration T seconds. In the case where the simulation type is a neutral hydrogen emission line signal, the neutral hydrogen emission line signal is generated according to formula (11) based on the neutral hydrogen signal frequency f HI, the doppler velocity v, and the relative acceleration v a.
(11)
In step S603, in the case that the analog type is the neutral hydrogen absorption line signal, the target filter is determined according to the simulation center frequency, the second simulation parameter, and the preset filter parameter.
The preset filter parameters need to be set according to actual filtering requirements, and are not particularly limited herein.
In step S604, white gaussian noise is acquired, and the white gaussian noise is used as a target background noise.
Step S605, filtering the target background noise by a target filter to obtain a neutral hydrogen absorption line signal.
Illustratively, for a neutral hydrogen absorption line signal, the energy of the frequency band in which the signal is located is absorbed, forming a "notch" in the frequency spectrum, and by designing the target filter, a neutral hydrogen absorption line signal simulation can be achieved, as shown in equation (12).
(12)
Wherein, the Is a target filter; A signal start frequency relative to the simulated center frequency Fc formed for doppler motion; signal cut-off frequency relative to the simulated center frequency Fc formed for doppler motion; Is the target background noise.
In one exemplary embodiment, the neutral hydrogen emission line signal power spectrum and the neutral hydrogen absorption line signal power spectrum are shown in fig. 7.
And step S606, according to the electromagnetic environment simulation parameters, the neutral hydrogen emission line signal or the neutral hydrogen absorption line signal is subjected to noise adding treatment to obtain a target neutral hydrogen signal.
Illustratively, the neutral hydrogen emission line is signaled according to a preset signal-to-noise ratioOr neutral hydrogen absorption line signalThe gaussian white noise (t) is added to obtain the target neutral hydrogen signal s c (t) as shown in equation (13).
(13)
In the embodiment, the neutral hydrogen emission line signal can be accurately generated based on the second simulation parameters corresponding to the neutral hydrogen signal, the target background noise is filtered through the target filter, the neutral hydrogen absorption line signal can be accurately obtained, the initial neutral hydrogen signal can be determined according to the neutral hydrogen emission line signal and the neutral hydrogen absorption line signal, further, the initial neutral hydrogen signal is subjected to noise adding according to the electromagnetic environment simulation parameters, the target neutral hydrogen signal is obtained, the neutral hydrogen signal characteristics in a real universe environment can be effectively simulated, and accurate and reliable neutral hydrogen signal simulation data are provided for radio telescope debugging and testing.
In one embodiment, the predetermined filter parameters include a stop band attenuation value, and determining the target filter based on the simulated center frequency, the second simulated parameters, and the predetermined filter parameters comprises the steps of:
and step 1, obtaining the relative frequency position of neutral hydrogen according to the simulation center frequency and the second simulation parameter.
Wherein the neutral hydrogen relative frequency location comprises a signal start frequency and a signal cut-off frequency.
The signal starting frequency refers to the signal starting frequency of the Doppler motion relative to the simulation center frequency, and the signal cut-off frequency refers to the signal cut-off frequency of the Doppler motion relative to the simulation center frequency.
Illustratively, the neutral hydrogen relative frequency position, i.e., the signal start frequency and the signal cut-off frequency, is obtained according to equation (14) based on the simulated center frequency FcMHz and the neutral hydrogen signal frequency f HI, the Doppler velocity v, and the relative acceleration v a.
(14)
Wherein, the A signal start frequency relative to the simulated center frequency Fc formed for doppler motion; Signal cut-off frequency relative to the simulated center frequency Fc formed for doppler motion.
And 2, generating a stop band frequency and a pass band frequency according to the signal starting frequency and the signal cut-off frequency.
Illustratively, based on equation (14), the stop band frequency is generated from the signal start frequency and the signal cut-off frequencyPassband frequency of。
And step 3, determining the target filter according to the stop band frequency, the pass band frequency and the stop band attenuation value.
Wherein the target filter is a high pass filter.
Illustratively according to the stop band frequencyPassband frequencyAnd a stop band attenuation value As, a corresponding high pass filter can be designed。
In the embodiment, the accurate neutral hydrogen relative frequency position can be obtained according to the simulation center frequency and the second simulation parameters, the stop band frequency and the pass band frequency are generated based on the signal starting frequency and the signal cut-off frequency, a foundation is laid for generating a reliable and accurate target filter, and the target filter is determined based on the stop band frequency, the pass band frequency and the stop band attenuation value, so that a foundation is laid for accurately simulating a neutral hydrogen absorption line signal.
In one embodiment, as shown in fig. 8, fig. 8 is a flow chart of a pulsar signal simulation step in one embodiment, and based on electromagnetic environment simulation parameters, the simulation is performed according to a pulsar signal simulation mode to obtain a target pulsar signal, which comprises the following steps:
Step S801, a third analog parameter corresponding to the pulsar signal is obtained.
The third analog parameters include pulse number, relative amplitude, relative center position, signal center frequency, bandwidth, full width at half maximum of pulse, and dispersion.
The number of pulses determines the specific type of the pulsar signal, and needs to be set according to actual requirements, which is not particularly limited herein.
Illustratively, the number of pulses is denoted as N, n=1 for a single pulse, with other parameters set in order as needed, where the pulse width is typically on the order of microseconds or milliseconds, N >1 for multiple pulses, with other parameters set in order as needed, where the pulse width is typically on the order of microseconds or milliseconds, N >1 for a micro pulse, with other parameters set in order as needed, note that the micro pulse has a microstructure, which can be regarded approximately as a combination of a plurality of pulses with very small pulse widths, with an overall width typically on the order of microseconds or milliseconds, and with a pulse width typically on the order of nanoseconds for a macro pulse, n=1.
Step S802, generating a second pulse envelope and a second baseband signal according to the third analog parameter.
Wherein the second pulse envelope comprises a single peak pulse, a multi peak pulse, a micro pulse, and a macro pulse. And the second baseband signal is simulated by adopting zero intermediate frequency complex Gaussian band-limited noise.
Illustratively, a pulsar signal is typically made up of a pulse train with a definite repetition period T PRP, and since the SDR device adopts a cyclic transmission mode, the simulation duration should be set to the repetition period, i.e., t=t PRP, at the time of pulsar signal simulation. The envelope profiles of the pulsar are different and at least comprise one of single-peak pulse, multi-peak pulse, micro-pulse and giant pulse, different pulse envelope profiles can be generated by adopting a multi-Gaussian pulse combination mode, and specifically, a second pulse envelope can be generated according to a formula (15) according to a third simulation parameter.
(15)
Wherein N is the number of Gaussian pulses, k is the pulse sequence number, A k is the relative amplitude, tc k is the relative center position,In order to be the full width at half maximum of the pulse,Is the standard deviation of the two-dimensional image,. Pulse profile starting point;The first pulse is relative to the central position, and the end point isWherein, the method comprises the steps of,Refers to the relative central position of the N-th pulse, and the overall pulse width is。
It should be noted that, the specific implementation manner of generating the second baseband signal according to the third analog parameter is the same as the implementation method principle of generating the first baseband signal according to the first analog parameter described in the above embodiment, and will not be described herein.
Step S803, generating a second intermediate signal according to the second pulse envelope and the second baseband signal.
Step S804, performing dispersion simulation on the second intermediate signal to obtain an initial pulsar signal.
It should be noted that, the specific implementation manner of step S803 to step S804 is the same as the implementation principle of step S303 to step S304 described in the above embodiment, and the specific process is not described herein again.
For example, referring to fig. 9-11, fig. 9 is a time domain frequency domain waveform when the second intermediate signal is a plurality of pulse envelope profiles, fig. 10 is a time domain frequency domain waveform when the second intermediate signal is a giant pulse, and fig. 11 is a time domain frequency domain waveform when the second intermediate signal is a micro pulse.
And step S805, according to the electromagnetic environment simulation parameters, performing noise adding processing on the initial pulsar signal to obtain a target pulsar signal.
Illustratively, the pulsar signal is recorded asThe start time T b=0,Tp is the pulse width, and the pulsar signal is processed according to the preset signal-to-noise ratioAdding Gaussian white noise (t) to obtain a target pulsar signal s c (t):
(16)
In the embodiment, a second pulse envelope and a second baseband signal are generated through a third simulation parameter corresponding to the pulse signal, a second intermediate signal is further synthesized, dispersion simulation is carried out on the second intermediate signal to obtain an initial pulsar signal, the basic consistency of the initial pulsar signal in the aspects of frequency spectrum characteristics, time structure, propagation effect and the like and the real situation is ensured, a reliable data base is provided for the pulsar signal discovery and analysis of a radio telescope, further, noise adding processing is carried out on the initial pulsar signal according to electromagnetic environment simulation parameters to generate a target pulsar signal, and noise conforming to actual observation conditions is added to enable the target pulsar signal to be closer to the real pulsar signal, so that the accuracy and reliability of the target pulsar signal simulation are improved.
In one embodiment, as shown in fig. 12, fig. 12 is a flow chart of a target radio frequency interference signal simulation step in one embodiment, electromagnetic environment simulation parameters including simulation center frequency, sampling frequency, simulation duration, radio astronomical signal simulation parameters and radio frequency interference simulation parameters, target radio frequency interference signals including broadband radio frequency interference signals, and obtaining target radio frequency interference signals determined according to the electromagnetic environment simulation parameters, including the following steps:
step S1201, a fourth analog parameter corresponding to the wideband radio frequency interference signal is obtained.
Wherein the fourth analog parameters include full width at half maximum, pulse center frequency, bandwidth, and exemplary pulse width of a single pulseThe pulse center frequency is f 0, and the bandwidth is BW.
Step S1202, generating a third pulse envelope and a third baseband signal according to the fourth analog parameter.
Illustratively, a third pulse envelope is generated based on the fourth analog parameter and the third baseband signal, the third pulse envelope being recorded asThe third baseband signal is denoted as m (t), where,Is the pulse width. Wherein the pulse widthIs the same as the pulse width described in the above embodiment equation (5)Relation to pulse full width half maximum FWHM (i.e) The same is not described in detail herein.
It should be noted that, the specific implementation manner of generating the third baseband signal according to the fourth analog parameter is the same as the specific implementation manner of generating the first baseband signal according to the first analog parameter described in the above embodiment, and is not described herein again.
In step S1203, single carrier pulse interference is generated according to the simulation center frequency, the first target parameter of the fourth simulation parameters, and the third pulse envelope.
Wherein the first target parameter comprises a pulse center frequency and a pulse full width at half maximum.
Illustratively, according to the simulated center frequency Fc, the pulse center frequency f 0, the pulse widthAnd a third pulse envelopeThe single carrier impulse interference is generated according to the formula (17), and the time domain and frequency domain waveform corresponding to the single carrier impulse interference is shown in fig. 13.
(17)
In step S1204, random noise impulse interference is generated according to the second target parameter, the third impulse envelope and the third baseband signal in the simulation center frequency and the fourth simulation parameter.
Wherein the second target parameter comprises bandwidth and pulse full width at half maximum.
Illustratively, according to the simulated center frequency Fc, the bandwidth BW, the pulse widthEnvelope of third pulseAnd a third baseband signal m (t), generating random noise impulse interference according to a formula (18), wherein a time domain and frequency domain waveform corresponding to the random noise impulse interference is shown in fig. 14.
(18)
Step S1205, generating a chirp disturbance according to the simulation center frequency, a third target parameter of the fourth simulation parameters, and the third pulse envelope.
Wherein the third target parameter comprises pulse center frequency, bandwidth, and pulse full width at half maximum.
Illustratively, according to the simulated center frequency Fc, the bandwidth BW, the pulse widthAnd a third pulse envelopeThe chirp disturbance is generated according to equation (19). The corresponding time domain frequency domain waveform for chirped pulse interference is shown in fig. 15.
(19)
Wherein the initial frequencyModulation rate。
In step S1206, a target radio frequency interference signal is determined from the single carrier pulse interference, the random noise pulse interference and the chirp pulse interference according to the electromagnetic environment simulation parameters.
After the simulation of the single pulse, i.e. the target radio frequency interference signal is completed, the pulse repetition period can be set to be randomly generated or configured to generate a pulse train, and further optionally, the power of the pulse train can be normalized, and the pulse train at this time is the target radio frequency interference signal.
In this embodiment, based on the fourth analog parameter corresponding to the wideband radio frequency interference signal, three types of wideband radio frequency interference signals including a single carrier pulse, a random noise pulse and a linear frequency modulation pulse can be respectively simulated, different types of radio frequency interference can be selected for testing according to the needs, so that not only is the diversity of testing scenes increased, but also experiments can be customized according to specific problems.
In one embodiment, constructing the radioastronomical electromagnetic environment from the target environment simulation signal comprises the steps of:
and step 1, carrying out fixed-point quantization processing on the target environment simulation signal to obtain a quantized environment simulation signal.
The method for performing fixed-point quantization processing on the target environment simulation signal can be used for performing data format conversion on the target environment simulation signal according to the bit width of a digital-to-analog converter supported by the SDR device.
And 2, transmitting the quantized environment simulation signal to a target software radio transmission platform.
The format of the quantized environment simulation signal is the same as that supported by the target software radio transmission platform, so that the quantized environment simulation signal can be successfully transmitted from the radio astronomical electromagnetic environment simulation platform to the target software radio transmission platform.
And 3, constructing the radio astronomical electromagnetic environment based on the target software radio transmitting platform and the quantized environment simulation signal.
The target software radio transmitting platform comprises SDR equipment, main operating parameters of the SDR equipment are set, the main operating parameters comprise transmitting frequency, transmitting gain, filter bandwidth, transmitting times and the like, quantized environment simulation signals and the main operating parameters are transmitted from the radio astronomical electromagnetic environment simulation platform to the SDR equipment through network communication according to a preset communication protocol, and further, the radio astronomical electromagnetic environment simulation platform sends instructions to control the SDR equipment to start and stop transmitting through network communication.
In the embodiment, the radio astronomical electromagnetic environment is constructed based on the target software radio emission platform and the quantized environment simulation signal, and a simulation source with low cost and high flexibility is provided for calibration, debugging and testing of a radio astronomical system.
The method is applied to a radio astronomical electromagnetic environment simulation system, the basic consistency of a generated target environment simulation signal and an actually observed radio astronomical signal can be ensured by acquiring electromagnetic environment simulation parameters and target environment simulation modes, wherein the target environment simulation mode at least comprises any one of a plurality of environment simulation modes, further, the target simulation mode corresponding to the target environment simulation mode is determined according to a preset corresponding relation, the preset corresponding relation comprises the corresponding relation between the environment simulation mode and the simulation mode, the simulation is carried out according to the target simulation mode based on electromagnetic environment simulation parameters, the target radio astronomical signal corresponding to the target environment simulation mode is determined, the most suitable simulation mode can be automatically selected according to different target environment simulation modes based on the preset corresponding relation to generate the corresponding target radio astronomical signal, a foundation is laid for enhancing the flexibility and the adaptability of the radio astronomical electromagnetic environment simulation, further, the target radio frequency interference signal and the target radio frequency interference signal determined according to the electromagnetic environment simulation parameters are acquired, the target radio frequency interference signal is subjected to superposition processing, the target radio astronomical environment simulation signal is obtained, the target environment simulation signal is simulated according to the target environment simulation mode, the target radio astronomical signal is more accurately constructed according to different target environment simulation modes, the actual environment simulation environment can not be more accurately restored, and the problem of the current environment can be avoided is solved, and the real environment can not be constructed according to the actual environment is more environment, and the real environment is more environment can be more easily realized, the flexibility and the adaptability of the radio astronomical electromagnetic environment simulation and construction are improved.
In one embodiment, the radio astronomical electromagnetic environment simulation system comprises a radio astronomical electromagnetic environment simulation platform and a target software radio transmission platform, wherein the radio astronomical electromagnetic environment simulation platform is in communication connection with the target software radio transmission platform;
The radio astronomical electromagnetic environment simulation platform is used for acquiring electromagnetic environment simulation parameters and a target environment simulation mode, wherein the target environment simulation mode at least comprises any one of a plurality of environment simulation modes, a target simulation mode corresponding to the target environment simulation mode is determined according to a preset corresponding relation, the preset corresponding relation comprises a corresponding relation between the environment simulation mode and the simulation mode, simulation is carried out according to the target simulation mode based on the electromagnetic environment simulation parameters, a target radio frequency interference signal corresponding to the target environment simulation mode is determined, and the target radio frequency interference signal determined according to the electromagnetic environment simulation parameters is acquired;
The target software radio emission platform is also used for constructing a radio astronomical electromagnetic environment according to the target environment simulation signal.
The radio astronomical electromagnetic environment simulation platform is also used for configuring electromagnetic environment simulation parameters and a target environment simulation mode.
Illustratively, referring to fig. 16, the radioastronomical electromagnetic environment simulation system includes a radioastronomical electromagnetic environment simulation platform and a target software radio transmission platform. The radio astronomical electromagnetic environment simulation platform is mainly used for simulating and adding a rapid radio storm signal, a neutral hydrogen signal, a pulsar signal, a broadband RFI and a narrow-band RFI, generating data required by SDR equipment and controlling the work of the SDR equipment. The target software radio transmitting platform comprises software radio SDR equipment and an antenna, wherein the SDR equipment is used for digital-to-analog conversion, filtering and amplification of signals, and the antenna is used for signal radiation.
In the embodiment, based on the radio astronomical electromagnetic environment simulation system, the high reduction of the complex radio astronomical electromagnetic environment can be realized, the problem that the radio astronomical electromagnetic environment simulation and construction flexibility are low due to the fact that the specified type of radio astronomical signals cannot be simulated in the prior art is avoided, and the flexibility and the adaptability of the radio astronomical electromagnetic environment simulation and construction are improved.
In a specific embodiment, based on a radio astronomical electromagnetic environment simulation system, the radio astronomical electromagnetic environment simulation and construction method comprises the following steps:
Step 1, electromagnetic environment simulation parameters and target environment simulation modes are configured through a radio astronomical electromagnetic environment simulation platform.
The electromagnetic environment simulation parameters comprise a simulation center frequency Fc, a sampling frequency Fs and a simulation duration T. Illustratively, for example, the simulation center frequency Fc is 1GHz, the sampling frequency Fs is 2GSPS, the simulation duration T is 0.01s, and the like, and it is noted that the simulation duration is related to the data storage and transmission capability of the SDR device and needs to be reasonably set.
Step 2, determining a target simulation mode corresponding to the target environment simulation mode according to a preset corresponding relation through a radio astronomical electromagnetic environment simulation platform, simulating according to the target simulation mode based on electromagnetic environment simulation parameters, determining a target radio astronomical signal corresponding to the target environment simulation mode, acquiring a target radio frequency interference signal determined according to the electromagnetic environment simulation parameters, and performing superposition processing on the target radio frequency interference signal and the target radio frequency interference signal to obtain a target environment simulation signal.
And 3, transmitting the target environment simulation signal from the radio astronomical electromagnetic environment simulation platform to the target software radio transmission platform through network communication.
And 4, configuring the working parameters of the target software radio transmission platform.
The operating parameters include transmission frequency, transmission gain, filter bandwidth, transmission times, etc.
And 5, constructing the radio astronomical electromagnetic environment based on the target software radio transmitting platform according to the target environment simulation signal.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a radio astronomical electromagnetic environment simulation and construction device for realizing the above-mentioned radio astronomical electromagnetic environment simulation and construction method. The implementation scheme of the solution provided by the device is similar to the implementation scheme recorded in the method, so the specific limitation in the embodiments of the one or more radio astronomical electromagnetic environment simulation devices provided below can be referred to the limitation of the radio astronomical electromagnetic environment simulation and construction method hereinabove, and the description thereof is omitted here.
In one exemplary embodiment, as shown in FIG. 17, FIG. 17 is a block diagram of a radio astronomical electromagnetic environment simulation and construction device in one embodiment, which includes an acquisition module 1701, a simulation mode determination module 1702, a radio astronomical signal determination module 1703, a radio frequency interference signal acquisition module 1704, a processing module 1705, and an electromagnetic environment construction module 1706;
the acquisition module 1701 is used for acquiring electromagnetic environment simulation parameters and a target environment simulation mode, wherein the target environment simulation mode at least comprises any one of a plurality of environment simulation modes;
The simulation mode determining module 1702 is configured to determine a target simulation mode corresponding to the target environment simulation mode according to a preset corresponding relationship, where the preset corresponding relationship includes a corresponding relationship between the environment simulation mode and the simulation mode;
the radio astronomical signal determining module 1703 is configured to perform simulation according to a target simulation mode based on electromagnetic environment simulation parameters, and determine a target radio astronomical signal corresponding to the target environment simulation mode;
The radio frequency interference signal acquisition module 1704 is configured to acquire a target radio frequency interference signal determined according to the electromagnetic environment simulation parameter;
The processing module 1705 is configured to perform superposition processing on the target radio astronomical signal and the target radio frequency interference signal, so as to obtain a target environment simulation signal;
the electromagnetic environment construction module 1706 is configured to construct a radioastronomical electromagnetic environment according to the target environment simulation signal.
The radio astronomical electromagnetic environment simulation device can ensure the basic consistency of a generated target environment simulation signal and an actually observed radio astronomical signal by acquiring electromagnetic environment simulation parameters and target environment simulation modes, further, according to a preset corresponding relation, determine a target simulation mode corresponding to the target environment simulation mode, simulate according to the target simulation mode based on the electromagnetic environment simulation parameters, determine a target radio astronomical signal corresponding to the target environment simulation mode, automatically select the most suitable simulation mode according to different target environment simulation modes to generate a corresponding target radio astronomical signal based on the preset corresponding relation, lay a foundation for enhancing the flexibility and adaptability of radio astronomical electromagnetic environment simulation, further, by acquiring the target radio frequency interference signal determined according to the electromagnetic environment simulation parameters, and carrying out superposition processing on the target radio frequency interference signal and the target radio frequency interference signal, obtain a target environment simulation signal, ensure that the target environment simulation signal is more close to the actual condition, improve the accuracy and the authenticity of the target environment simulation signal, construct the radio astronomical electromagnetic environment according to the target environment simulation signal, realize the fact that the complex radio astronomical electromagnetic environment is constructed according to the target environment simulation signal, and the problem that the radio astronomical electromagnetic environment cannot be restored due to the fact that the electromagnetic environment is highly-designated by the electromagnetic environment is high is solved and the flexibility is not suitable for constructing the existing electromagnetic environment.
In one embodiment, the electromagnetic environment simulation parameters comprise simulation center frequency, sampling frequency, simulation duration, radio astronomical signal simulation parameters and radio frequency interference simulation parameters, environment simulation modes comprise a rapid radio storm electromagnetic environment simulation mode, a neutral hydrogen electromagnetic environment simulation mode and a pulsar electromagnetic environment simulation mode, and the radio astronomical signal determination module 1703 is also used for
Under the condition that the target environment simulation mode is a rapid-shooting-storm electromagnetic environment simulation mode, simulating according to a rapid-shooting-storm signal simulation mode based on electromagnetic environment simulation parameters to obtain a target rapid-shooting-storm signal;
under the condition that the target environment simulation mode is a neutral hydrogen electromagnetic environment simulation mode, simulating according to a neutral hydrogen signal simulation mode based on electromagnetic environment simulation parameters to obtain a target neutral hydrogen signal;
and under the condition that the target environment simulation mode is a pulsar electromagnetic environment simulation mode, simulating according to a pulsar signal simulation mode based on electromagnetic environment simulation parameters to obtain a target pulsar signal.
In one embodiment, the radioastronomical signal determination module 1703 is also configured to
Acquiring a first analog parameter corresponding to a rapid radio storm signal, wherein the first analog parameter comprises signal center frequency, bandwidth, full width at half maximum of pulse and dispersion;
Generating a first pulse envelope and a first baseband signal according to the first simulation parameters;
generating a first intermediate signal from the first pulse envelope and the first baseband signal;
performing dispersion simulation on the first intermediate signal to obtain an initial rapid radio storm signal;
and (3) according to the electromagnetic environment simulation parameters, carrying out noise adding processing on the initial rapid radio storm signal to obtain the target rapid radio storm signal.
In one embodiment, the radioastronomical signal determination module 1703 is also configured to
Obtaining a simulation type corresponding to the neutral hydrogen signal and a second simulation parameter, wherein the second simulation parameter comprises Doppler speed and relative acceleration;
generating a neutral hydrogen emission line signal according to the second simulation parameter in the case that the simulation type is the neutral hydrogen emission line signal;
under the condition that the simulation type is a neutral hydrogen absorption line signal, determining a target filter according to the simulation center frequency, the second simulation parameter and a preset filter parameter;
acquiring Gaussian white noise, and taking the Gaussian white noise as target background noise;
Filtering the target background noise through a target filter to obtain a neutral hydrogen absorption line signal;
and (3) according to electromagnetic environment simulation parameters, carrying out noise adding treatment on the neutral hydrogen emission line signal or the neutral hydrogen absorption line signal to obtain a target neutral hydrogen signal.
In one embodiment, the preset filter parameters include stop band attenuation values, a radioastronomical signal determination module 1703, also for
Obtaining a neutral hydrogen relative frequency position according to the simulation center frequency and the second simulation parameter, wherein the neutral hydrogen relative frequency position comprises a signal starting frequency and a signal cut-off frequency;
generating a stop band frequency and a pass band frequency according to the signal starting frequency and the signal cut-off frequency;
And determining a target filter according to the stop band frequency, the pass band frequency and the stop band attenuation value, wherein the target filter is a high-pass filter.
In one embodiment, the radioastronomical signal determination module 1703 is also configured to
Acquiring a third simulation parameter corresponding to the pulsar signal;
Generating a second pulse envelope and a second baseband signal according to the third analog parameter, wherein the second pulse envelope comprises a single peak pulse, a multi-peak pulse, a micro pulse and a giant pulse;
generating a second intermediate signal from the second pulse envelope and the second baseband signal;
performing dispersion simulation on the second intermediate signal to obtain an initial pulsar signal;
And (3) carrying out noise adding processing on the initial pulsar signal according to the electromagnetic environment simulation parameters to obtain a target pulsar signal.
In one embodiment, the electromagnetic environment simulation parameters include simulation center frequency, sampling frequency, simulation duration, radio astronomical signal simulation parameters and radio frequency interference simulation parameters, the target radio frequency interference signal includes broadband radio frequency interference signal, the radio frequency interference signal acquisition module 1704 is further configured to
Acquiring a fourth simulation parameter corresponding to the broadband radio frequency interference signal;
generating a third pulse envelope and a third baseband signal according to the fourth simulation parameter;
Generating single carrier pulse interference according to the simulation center frequency, a first target parameter in the fourth simulation parameter and a third pulse envelope, wherein the first target parameter comprises the pulse center frequency and the full width at half maximum;
Generating random noise pulse interference according to the simulation center frequency, a second target parameter in the fourth simulation parameter, a third pulse envelope and a third baseband signal, wherein the second target parameter comprises bandwidth and full width at half maximum of the pulse;
Generating linear frequency modulation pulse interference according to the simulation center frequency, a third target parameter in the fourth simulation parameters and a third pulse envelope, wherein the third target parameter comprises pulse center frequency, bandwidth and pulse full width at half maximum;
and determining the target radio frequency interference signal from the single carrier pulse, the random noise pulse and the linear frequency modulation pulse according to the electromagnetic environment simulation parameters.
In one embodiment, the electromagnetic environment construction module 1706 is also configured to
Performing fixed-point quantization processing on the target environment simulation signal to obtain a quantized environment simulation signal;
transmitting the quantized environment simulation signal to a target software radio transmission platform;
and constructing the radio astronomical electromagnetic environment based on the target software radio transmission platform and the quantized environment simulation signal.
The above-mentioned various modules in the radio astronomical electromagnetic environment simulation device can be implemented in whole or in part by software, hardware and their combination. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one exemplary embodiment, a computer device is provided, which may be a server, and the internal structure thereof may be as shown in fig. 18. The computer device includes a processor, a memory, an Input/Output interface (I/O) and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is used for storing radio astronomical electromagnetic environment simulation and construction related data. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by the processor, implements a radio astronomical electromagnetic environment simulation and construction method.
It will be appreciated by those skilled in the art that the structure shown in FIG. 18 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, there is also provided a computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile memory and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ResistiveRandom Access Memory, reRAM), magneto-resistive Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric RandomAccess Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static RandomAccess Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computation, an artificial intelligence (ARTIFICIALINTELLIGENCE, AI) processor, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the present application.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims (11)

1.一种射电天文电磁环境仿真与构建方法，其特征在于，应用于射电天文电磁环境仿真系统，所述方法包括：1. A radio astronomy electromagnetic environment simulation and construction method, characterized in that it is applied to a radio astronomy electromagnetic environment simulation system, and the method comprises: 获取电磁环境仿真参数以及目标环境仿真模式；所述目标环境仿真模式至少包括多种环境仿真模式中的任意一种；Acquire electromagnetic environment simulation parameters and a target environment simulation mode; the target environment simulation mode includes at least any one of a plurality of environment simulation modes; 根据预设对应关系，确定与所述目标环境仿真模式对应目标仿真方式；所述预设对应关系包括环境仿真模式和仿真方式之间的对应关系；Determine a target simulation mode corresponding to the target environment simulation mode according to a preset corresponding relationship; the preset corresponding relationship includes a corresponding relationship between the environment simulation mode and the simulation mode; 基于所述电磁环境仿真参数，按照所述目标仿真方式进行仿真，确定与所述目标环境仿真模式对应的目标射电天文信号；Based on the electromagnetic environment simulation parameters, simulation is performed according to the target simulation mode to determine a target radio astronomy signal corresponding to the target environment simulation mode; 获取根据所述电磁环境仿真参数进行射频干扰信号仿真所确定的目标射频干扰信号；Acquire a target radio frequency interference signal determined by performing radio frequency interference signal simulation according to the electromagnetic environment simulation parameters; 对所述目标射电天文信号以及所述目标射频干扰信号进行叠加处理，得到目标环境仿真信号；Performing superposition processing on the target radio astronomy signal and the target radio frequency interference signal to obtain a target environment simulation signal; 对所述目标环境仿真信号进行定点量化处理，得到量化环境仿真信号；Performing fixed-point quantization processing on the target environment simulation signal to obtain a quantized environment simulation signal; 将所述量化环境仿真信号传输至目标软件无线电发射平台；Transmitting the quantized environment simulation signal to a target software radio transmission platform; 基于所述目标软件无线电发射平台以及所述量化环境仿真信号，对射电天文电磁环境进行构建。Based on the target software radio transmission platform and the quantized environment simulation signal, a radio astronomy electromagnetic environment is constructed. 2.根据权利要求1所述的方法，其特征在于，所述电磁环境仿真参数，包括仿真中心频率、采样频率、仿真时长、射电天文信号仿真参数以及射频干扰仿真参数；所述环境仿真模式，包括快速射电暴电磁环境仿真模式、中性氢电磁环境仿真模式以及脉冲星电磁环境仿真模式；所述基于所述电磁环境仿真参数，按照所述目标仿真方式进行仿真，确定与所述目标环境仿真模式对应的目标射电天文信号，包括：2. The method according to claim 1 is characterized in that the electromagnetic environment simulation parameters include simulation center frequency, sampling frequency, simulation duration, radio astronomy signal simulation parameters and radio frequency interference simulation parameters; the environment simulation mode includes fast radio burst electromagnetic environment simulation mode, neutral hydrogen electromagnetic environment simulation mode and pulsar electromagnetic environment simulation mode; the simulation based on the electromagnetic environment simulation parameters according to the target simulation mode to determine the target radio astronomy signal corresponding to the target environment simulation mode includes: 在所述目标环境仿真模式为快速射电暴电磁环境仿真模式的情况下，基于所述电磁环境仿真参数，按照快速射电暴信号仿真方式进行仿真，得到目标快速射电暴信号；When the target environment simulation mode is a fast radio burst electromagnetic environment simulation mode, based on the electromagnetic environment simulation parameters, simulation is performed in accordance with a fast radio burst signal simulation mode to obtain a target fast radio burst signal; 在所述目标环境仿真模式为中性氢电磁环境仿真模式的情况下，基于所述电磁环境仿真参数，按照中性氢信号仿真方式进行仿真，得到目标中性氢信号；When the target environment simulation mode is a neutral hydrogen electromagnetic environment simulation mode, based on the electromagnetic environment simulation parameters, simulation is performed in a neutral hydrogen signal simulation mode to obtain a target neutral hydrogen signal; 在所述目标环境仿真模式为脉冲星电磁环境仿真模式的情况下，基于所述电磁环境仿真参数，按照脉冲星信号仿真方式进行仿真，得到目标脉冲星信号。When the target environment simulation mode is a pulsar electromagnetic environment simulation mode, simulation is performed in a pulsar signal simulation manner based on the electromagnetic environment simulation parameters to obtain a target pulsar signal. 3.根据权利要求2所述的方法，其特征在于，所述基于所述电磁环境仿真参数，按照快速射电暴信号仿真方式进行仿真，得到目标快速射电暴信号，包括：3. The method according to claim 2, characterized in that the simulation based on the electromagnetic environment simulation parameters is performed in accordance with a fast radio burst signal simulation method to obtain a target fast radio burst signal, comprising: 获取快速射电暴信号对应的第一模拟参数；所述第一模拟参数包括信号中心频率、带宽、脉冲半高全宽以及色散量；Acquire first simulation parameters corresponding to the fast radio burst signal; the first simulation parameters include signal center frequency, bandwidth, pulse half-width, and dispersion; 根据所述第一模拟参数，生成第一脉冲包络以及第一基带信号；Generate a first pulse envelope and a first baseband signal according to the first simulation parameter; 根据所述第一脉冲包络以及所述第一基带信号，生成第一中间信号；Generate a first intermediate signal according to the first pulse envelope and the first baseband signal; 对所述第一中间信号进行色散仿真，得到初始快速射电暴信号；Performing dispersion simulation on the first intermediate signal to obtain an initial fast radio burst signal; 根据所述电磁环境仿真参数，对所述初始快速射电暴信号进行加噪处理，得到目标快速射电暴信号。The initial fast radio burst signal is subjected to noise addition processing according to the electromagnetic environment simulation parameters to obtain a target fast radio burst signal. 4.根据权利要求2所述的方法，其特征在于，所述基于所述电磁环境仿真参数，按照中性氢信号仿真方式进行仿真，得到目标中性氢信号，包括：4. The method according to claim 2, characterized in that the simulation is performed based on the electromagnetic environment simulation parameters in accordance with a neutral hydrogen signal simulation method to obtain a target neutral hydrogen signal, comprising: 获取中性氢信号对应的模拟类型以及第二模拟参数；所述第二模拟参数包括多普勒速度以及相对加速度；Acquire a simulation type and a second simulation parameter corresponding to the neutral hydrogen signal; the second simulation parameter includes a Doppler velocity and a relative acceleration; 在所述模拟类型为中性氢发射线信号的情况下，根据所述第二模拟参数，生成中性氢发射线信号；When the simulation type is a neutral hydrogen emission line signal, generating a neutral hydrogen emission line signal according to the second simulation parameter; 在所述模拟类型为中性氢吸收线信号的情况下，根据所述仿真中心频率、所述第二模拟参数以及预设滤波器参数，确定目标滤波器；In the case where the simulation type is a neutral hydrogen absorption line signal, determining a target filter according to the simulation center frequency, the second simulation parameter and a preset filter parameter; 获取高斯白噪声，将所述高斯白噪声作为目标背景噪声；Obtaining Gaussian white noise, and using the Gaussian white noise as target background noise; 通过所述目标滤波器，对所述目标背景噪声进行滤波处理，得到中性氢吸收线信号；The target background noise is filtered by the target filter to obtain a neutral hydrogen absorption line signal; 根据所述电磁环境仿真参数，对所述中性氢发射线信号或中性氢吸收线信号进行加噪处理，得到目标中性氢信号。According to the electromagnetic environment simulation parameters, the neutral hydrogen emission line signal or the neutral hydrogen absorption line signal is subjected to noise processing to obtain a target neutral hydrogen signal. 5.根据权利要求4所述的方法，其特征在于，所述预设滤波器参数包括阻带衰减值；所述根据所述仿真中心频率、所述第二模拟参数以及预设滤波器参数，确定目标滤波器，包括：5. The method according to claim 4, characterized in that the preset filter parameters include a stopband attenuation value; and determining the target filter according to the simulation center frequency, the second simulation parameter and the preset filter parameters comprises: 根据所述仿真中心频率以及所述第二模拟参数，得到中性氢相对频率位置；所述中性氢相对频率位置包括信号起始频率以及信号截止频率；According to the simulation center frequency and the second simulation parameter, a relative frequency position of neutral hydrogen is obtained; the relative frequency position of neutral hydrogen includes a signal start frequency and a signal cutoff frequency; 根据所述信号起始频率以及所述信号截止频率，生成阻带频率以及通带频率；Generate a stopband frequency and a passband frequency according to the signal start frequency and the signal cutoff frequency; 根据所述阻带频率、所述通带频率以及所述阻带衰减值，确定目标滤波器；所述目标滤波器为高通滤波器。A target filter is determined according to the stopband frequency, the passband frequency and the stopband attenuation value; the target filter is a high-pass filter. 6.根据权利要求2所述的方法，其特征在于，所述基于所述电磁环境仿真参数，按照脉冲星信号仿真方式进行仿真，得到目标脉冲星信号，包括：6. The method according to claim 2, characterized in that the step of simulating according to a pulsar signal simulation method based on the electromagnetic environment simulation parameters to obtain a target pulsar signal comprises: 获取脉冲星信号对应的第三模拟参数；Obtaining a third simulation parameter corresponding to the pulsar signal; 根据所述第三模拟参数，生成第二脉冲包络以及第二基带信号；所述第二脉冲包络包括单峰脉冲、多峰脉冲、微脉冲以及巨脉冲；Generate a second pulse envelope and a second baseband signal according to the third simulation parameter; the second pulse envelope includes a single-peak pulse, a multi-peak pulse, a micro-pulse and a giant pulse; 根据所述第二脉冲包络以及所述第二基带信号，生成第二中间信号；generating a second intermediate signal according to the second pulse envelope and the second baseband signal; 对所述第二中间信号进行色散仿真，得到初始脉冲星信号；Performing dispersion simulation on the second intermediate signal to obtain an initial pulsar signal; 根据所述电磁环境仿真参数，对所述初始脉冲星信号进行加噪处理，得到目标脉冲星信号。According to the electromagnetic environment simulation parameters, the initial pulsar signal is subjected to noise processing to obtain a target pulsar signal. 7.根据权利要求1所述的方法，其特征在于，所述电磁环境仿真参数，包括仿真中心频率、采样频率、仿真时长、射电天文信号仿真参数以及射频干扰仿真参数；所述目标射频干扰信号包括宽带射频干扰信号；所述获取根据所述电磁环境仿真参数确定的目标射频干扰信号，包括：7. The method according to claim 1 is characterized in that the electromagnetic environment simulation parameters include simulation center frequency, sampling frequency, simulation duration, radio astronomy signal simulation parameters and radio frequency interference simulation parameters; the target radio frequency interference signal includes a broadband radio frequency interference signal; and the step of obtaining the target radio frequency interference signal determined according to the electromagnetic environment simulation parameters includes: 获取宽带射频干扰信号对应的第四模拟参数；Obtaining a fourth simulation parameter corresponding to the broadband radio frequency interference signal; 根据所述第四模拟参数，生成第三脉冲包络以及第三基带信号；generating a third pulse envelope and a third baseband signal according to the fourth simulation parameter; 根据所述仿真中心频率、所述第四模拟参数中的第一目标参数以及所述第三脉冲包络，生成单载波脉冲干扰；所述第一目标参数包括脉冲中心频率以及脉冲半高全宽；Generate single carrier pulse interference according to the simulation center frequency, the first target parameter in the fourth simulation parameter and the third pulse envelope; the first target parameter includes the pulse center frequency and the pulse half-height full width; 根据所述仿真中心频率、所述第四模拟参数中的第二目标参数、所述第三脉冲包络以及所述第三基带信号，生成随机噪声脉冲干扰；所述第二目标参数包括带宽以及脉冲半高全宽；Generate random noise pulse interference according to the simulation center frequency, the second target parameter in the fourth simulation parameter, the third pulse envelope and the third baseband signal; the second target parameter includes bandwidth and pulse half-height full width; 根据所述仿真中心频率、所述第四模拟参数中的第三目标参数以及所述第三脉冲包络，生成线性调频脉冲干扰；所述第三目标参数包括脉冲中心频率、带宽以及脉冲半高全宽；Generate linear frequency modulation pulse interference according to the simulation center frequency, the third target parameter in the fourth simulation parameter and the third pulse envelope; the third target parameter includes the pulse center frequency, bandwidth and pulse half-maximum full width; 根据所述电磁环境仿真参数，从所述单载波脉冲干扰、所述随机噪声脉冲干扰以及所述线性调频脉冲干扰中确定目标射频干扰信号。According to the electromagnetic environment simulation parameters, a target radio frequency interference signal is determined from the single carrier pulse interference, the random noise pulse interference and the linear frequency modulation pulse interference. 8.一种射电天文电磁环境仿真系统，其特征在于，所述系统包括射电天文电磁环境仿真平台和目标软件无线电发射平台；所述射电天文电磁环境仿真平台与所述目标软件无线电发射平台通信连接；8. A radio astronomy electromagnetic environment simulation system, characterized in that the system comprises a radio astronomy electromagnetic environment simulation platform and a target software radio transmission platform; the radio astronomy electromagnetic environment simulation platform is communicatively connected with the target software radio transmission platform; 所述射电天文电磁环境仿真平台，用于获取电磁环境仿真参数以及目标环境仿真模式；所述目标环境仿真模式至少包括多种环境仿真模式中的任意一种；根据预设对应关系，确定与所述目标环境仿真模式对应目标仿真方式；所述预设对应关系包括环境仿真模式和仿真方式之间的对应关系；基于所述电磁环境仿真参数，按照所述目标仿真方式进行仿真，确定与所述目标环境仿真模式对应的目标射电天文信号；获取根据所述电磁环境仿真参数进行射频干扰信号仿真所确定的目标射频干扰信号；对所述目标射电天文信号以及所述目标射频干扰信号进行叠加处理，得到目标环境仿真信号；对所述目标环境仿真信号进行定点量化处理，得到量化环境仿真信号；将所述量化环境仿真信号传输至目标软件无线电发射平台；The radio astronomy electromagnetic environment simulation platform is used to obtain electromagnetic environment simulation parameters and a target environment simulation mode; the target environment simulation mode includes at least any one of a plurality of environment simulation modes; according to a preset corresponding relationship, a target simulation mode corresponding to the target environment simulation mode is determined; the preset corresponding relationship includes a corresponding relationship between an environment simulation mode and a simulation mode; based on the electromagnetic environment simulation parameters, simulation is performed according to the target simulation mode to determine a target radio astronomy signal corresponding to the target environment simulation mode; a target radio frequency interference signal is obtained by simulating a radio frequency interference signal according to the electromagnetic environment simulation parameters; the target radio astronomy signal and the target radio frequency interference signal are superimposed to obtain a target environment simulation signal; the target environment simulation signal is fixed-point quantized to obtain a quantized environment simulation signal; and the quantized environment simulation signal is transmitted to a target software radio transmission platform; 所述目标软件无线电发射平台，用于基于所述目标软件无线电发射平台以及所述量化环境仿真信号，对射电天文电磁环境进行构建。The target software radio transmitting platform is used to construct a radio astronomy electromagnetic environment based on the target software radio transmitting platform and the quantized environment simulation signal. 9.一种计算机设备，包括存储器和处理器，所述存储器存储有计算机程序，其特征在于，所述处理器执行所述计算机程序时实现权利要求1至权利要求7中任一项所述的方法的步骤。9. A computer device, comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the steps of the method according to any one of claims 1 to 7 when executing the computer program. 10.一种计算机可读存储介质，其上存储有计算机程序，其特征在于，所述计算机程序被处理器执行时实现权利要求1至权利要求7中任一项所述的方法的步骤。10. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented. 11.一种计算机程序产品，包括计算机程序，其特征在于，所述计算机程序被处理器执行时实现权利要求1至权利要求7中任一项所述的方法的步骤。11. A computer program product, comprising a computer program, characterized in that when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.
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