CN112904377A - Beidou short message anti-interference method and device, computer equipment and storage medium - Google Patents

Abstract

The invention discloses a Beidou short message anti-interference method, device, computer equipment and storage medium, which relate to the technical field of global satellite navigation and are used for suppressing the interference of airborne Beidou short message transceiver equipment to airborne GPS receivers. The main technical scheme of the present invention is: acquiring the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna; according to the signal received by the GPS antenna and the Beidou short message transmitted by the Beidou short message antenna The message signal calculates the signal transmitted by the compensated Beidou short message antenna; the Beidou short message interference suppression is performed on the signal received by the GPS antenna through the signal transmitted by the compensated Beidou short message antenna, and the anti-Beidou short message is obtained. Short messages interfere with GPS signals.

Description

Beidou short message anti-interference method, device, computer equipment and storage medium

technical field

The invention relates to the technical field of global satellite navigation, in particular to a Beidou short message anti-jamming method, device, computer equipment and storage medium.

Background technique

Beidou satellite navigation system consists of three parts: space segment, ground segment and user segment. The space segment includes 5 geostationary orbit satellites (located at 58.75 degrees, 80 degrees, 110.5 degrees, 140 degrees and 160 degrees east longitude respectively) and 30 non-geostationary orbit satellites; the ground segment includes the main control station, injection station and monitoring station, etc. Several ground stations; the user segment includes Beidou user terminals and terminals compatible with other satellite navigation systems.

Among them, the 5 geostationary orbit satellites in the space segment have the RDSS short message communication function. The coverage of this communication function is between 5°-55° north latitude and 7°-140° east longitude. At about 35° north latitude. Within this range, it provides users with short message communication services around the clock without any communication blind spots.

The uplink frequency used by Beidou short messages is 1610-1626.5MHz, which is close to the L1 frequency (1575.42MHz) of the airborne GPS receiver. During the operation of the two, there is a situation that the GPS receiver is interfered by the signal transmitted by the Beidou short message device, which causes the GPS receiver to be unavailable during the transmission of the Beidou short message. Therefore, it is necessary to suppress the Beidou short message transmission signal in the GPS receiver. At present, most of the anti-jamming methods of GPS are to solve the problem of anti-space electromagnetic radiation noise, anti-fraud problems, etc., and there is no method for transmitting signal interference for Beidou short messages.

SUMMARY OF THE INVENTION

The invention provides a Beidou short message anti-interference method, device, computer equipment and storage medium, which are used for suppressing the interference of the airborne Beidou short message sending and receiving equipment to the airborne GPS receiver.

An embodiment of the present invention provides a Beidou short message anti-interference method, the method includes:

Obtain the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

Calculate the signal transmitted by the Beidou short message antenna after compensation according to the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

The signal received by the GPS antenna is subjected to Beidou short message interference suppression by the signal transmitted by the compensated Beidou short message antenna, so as to obtain a GPS signal that is resistant to Beidou short message interference

An embodiment of the present invention provides a Beidou short message anti-jamming device, and the device includes:

The acquisition module is used to acquire the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

a calculation module, used for calculating the signal transmitted by the Beidou short message antenna after compensation according to the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

The compensation module is used for suppressing the interference of Beidou short message on the signal received by the GPS antenna through the signal transmitted by the compensated Beidou short message antenna, so as to obtain a GPS signal that is resistant to the interference of the Beidou short message.

A computer device includes a memory, a processor, and a computer program stored in the memory and running on the processor, the processor implementing the above-mentioned anti-interference method for Beidou short messages when the processor executes the computer program.

A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned Beidou short message anti-jamming method is implemented.

The invention provides a Beidou short message anti-interference method, device, computer equipment and storage medium, which obtains the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna; The signal transmitted by the Beidou short message antenna and the Beidou short message signal transmitted by the Beidou short message antenna after the compensation is calculated; the signal transmitted by the Beidou short message antenna after the compensation is received by the GPS antenna. The received signal is subjected to Beidou short message interference suppression, and a GPS signal that is resistant to Beidou short message interference is obtained. Therefore, the short message signal received by the GPS antenna can be aligned with the signal transmitted by the short message antenna, thereby suppressing the short message interference in the GPS antenna signal.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the drawings that are used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

Fig. 1 is a flowchart of an anti-interference method for Beidou short messages in an embodiment of the present invention;

Fig. 2 is the principle block diagram of the Beidou short message anti-jamming device in an embodiment of the present invention;

FIG. 3 is a schematic diagram of a computer device in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in FIG. 1 , an embodiment of the present invention provides a Beidou short message anti-interference method, and the Beidou short message anti-interference method includes the following steps:

S10, acquiring the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna.

In the embodiment of the present invention, both the airborne GPS antenna and the airborne Beidou short message antenna are installed on the back of the fuselage, and the distance between them exceeds 15m. Wherein, the signal received by the GPS antenna is expressed as:

w ₂ (n)=u(n)+βv(n-τ)+e(n)

The Beidou short message signal transmitted by the Beidou short message antenna is expressed as:

w ₁ (n)=v(n)

Among them, n represents the signal sequence number in discrete digital signal processing, v(n) is the Beidou short message signal, u(n) is the GPS navigation satellite signal, β is the amplitude attenuation factor, τ is the time delay, e(n) Contains noise and satellite signals with an elevation angle less than 10°. If you choose a satellite with a pitch angle that is too small, the dop value will be too small, and the positioning accuracy will be lower, so generally do not choose a satellite with a pitch angle of less than 10 degrees.

S20: Calculate the compensated signal transmitted by the Beidou short message antenna according to the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna.

Since the Beidou short message signal transmitted by the Beidou short message can be obtained from the Beidou short message equipment information, the generalized cross-correlation method can be used to obtain the estimated time delay.

后，就可以对北斗短报文天线发射的信号进行延迟补偿。即根据所述时间延迟估计值

对所述北斗短报文天线发射的北斗短报文信号进行延迟时间补偿，延迟时间补偿后的北斗短报文信号为：get an estimate of the delay

After that, delay compensation can be performed on the signal transmitted by the Beidou short message antenna. That is, according to the time delay estimate

Delay time compensation is performed on the Beidou short message signal transmitted by the Beidou short message antenna, and the Beidou short message signal after the delay time compensation is:

Due to signal propagation loss, there is a difference in amplitude between the signal transmitted by the Beidou short message antenna and the signal received by the GPS antenna. Therefore, it is necessary to compensate the Beidou short message signal according to the delay time and the signal received by the GPS antenna. Calculate the magnitude decay factor estimate

通过求解如下最小二乘问题获得：Specifically, the estimated value of the amplitude attenuation factor

Obtained by solving the following least squares problem:

make:

w ₂ =[w ₂ (0),w ₂ (1),...,w ₂ (N-1)] ^T

Then the above formula can be expressed as:

Solving the least squares problem of the above formula, the estimated value of the amplitude attenuation factor can be obtained as:

S30, performing Beidou short message interference suppression on the signal received by the GPS antenna by using the signal transmitted by the compensated Beidou short message antenna to obtain a GPS signal that is resistant to Beidou short message interference.

After obtaining the estimated values of the delay and amplitude attenuation factors, delay compensation and amplitude compensation can be performed on the signal received by the Beidou short message antenna, and then the interference of the short message signal can be eliminated from the signal received by the GPS antenna. At the same time, the useful GPS satellite signals are retained to achieve the purpose of suppressing the interference of the airborne Beidou short message equipment. The signal received by the GPS antenna is canceled and suppressed, and the suppressed signal is:

为对消后的残留噪声。in,

is the residual noise after cancellation.

The embodiment of the present invention can cancel the Beidou short message signal received by the GPS antenna, so as to suppress the interference of the airborne Beidou short message transceiver equipment to the airborne GPS receiver. When suppressing the Beidou short message signal received by the GPS antenna, useful GPS navigation satellite signals can be retained. And when the Beidou short message signal received by the GPS antenna is suppressed, the trailing of the interference signal under the noise can be eliminated. The embodiments of the present invention can be applied in various global navigation satellite systems.

The invention provides an anti-interference method for Beidou short message, which acquires the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna; according to the signal received by the GPS antenna and the Beidou short message The Beidou short message signal transmitted by the GPS antenna is calculated from the signal transmitted by the compensated Beidou short message antenna; Interference suppression, get GPS signal that resists Beidou short message interference. Therefore, the short message signal received by the GPS antenna can be aligned with the signal transmitted by the short message antenna, thereby suppressing the short message interference in the GPS antenna signal.

It should be understood that the size of the sequence numbers of the steps in the above embodiments does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

In an embodiment, a Beidou short message anti-jamming device is provided, and the Beidou short message anti-jamming device corresponds one-to-one with the Beidou short message anti-jamming method in the above embodiment. As shown in FIG. 2 , the Beidou short message anti-jamming device includes: an acquisition module 10 , a calculation module 20 , and a compensation module 30 . The detailed description of each functional module is as follows:

The acquisition module 10 is used for acquiring the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

The calculation module 20 is used to calculate the signal transmitted by the Beidou short message antenna after compensation according to the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

The compensation module 30 is configured to perform BDS short message interference suppression on the signal received by the GPS antenna through the signal transmitted by the compensated BDS short message antenna, so as to obtain a GPS signal resistant to the BDS short message interference.

Specifically, the signal received by the GPS antenna is expressed as:

w ₂ (n)=u(n)+βv(n-τ)+e(n)

The Beidou short message signal transmitted by the Beidou short message antenna is expressed as:

w ₁ (n)=v(n)

Among them, v(n) is the Beidou short message signal, u(n) is the GPS navigation satellite signal, β is the amplitude attenuation factor, τ is the time delay, and e(n) contains noise and satellite signals with an elevation angle less than 10°.

The obtaining module 10 is also used to obtain the estimated time delay value

对所述北斗短报文天线发射的北斗短报文信号进行延迟时间补偿，延迟时间补偿后的北斗短报文信号为：According to the time delay estimate

Delay time compensation is performed on the Beidou short message signal transmitted by the Beidou short message antenna, and the Beidou short message signal after the delay time compensation is:

The calculation module 20 is further configured to calculate the estimated value of the amplitude attenuation factor according to the Beidou short message signal after the delay time compensation and the signal received by the GPS antenna

Specifically, the signal transmitted by the compensated Beidou short message antenna is:

The GPS signal for anti-Beidou short message interference is:

为对消后的残留噪声。in,

is the residual noise after cancellation.

通过求解如下最小二乘问题获得：Specifically, the estimated value of the amplitude attenuation factor

Obtained by solving the following least squares problem:

make:

w ₂ =[w ₂ (0),w ₂ (1),...,w ₂ (N-1)] ^T

Then the above formula can be expressed as:

Solving the least squares problem of the above formula, the estimated value of the amplitude attenuation factor can be obtained as:

In one embodiment, a computer device is provided, and the computer device may be a server, and its internal structure diagram may be as shown in FIG. 3 . The computer equipment includes a processor, memory, a network interface, and a database connected by a device bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium, an internal memory. The nonvolatile storage medium stores an operating device, a computer program, and a database. The internal memory provides an environment for the execution of operating devices and computer programs in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, an anti-interference method for Beidou short messages is realized.

In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored on the memory and running on the processor, and the processor implements the following steps when executing the computer program:

Obtain the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

Calculate the signal transmitted by the Beidou short message antenna after compensation according to the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

The signal received by the GPS antenna is subjected to Beidou short message interference suppression by using the signal transmitted by the compensated Beidou short message antenna, so as to obtain a GPS signal that is resistant to Beidou short message interference.

In one embodiment, a computer-readable storage medium is provided on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

Obtain the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

Calculate the signal transmitted by the Beidou short message antenna after compensation according to the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna;

The signal received by the GPS antenna is subjected to Beidou short message interference suppression by using the signal transmitted by the compensated Beidou short message antenna, so as to obtain a GPS signal that is resistant to Beidou short message interference.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented by instructing relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage In the medium, when the computer program is executed, it may include the processes of the above-mentioned method embodiments. Wherein, any reference to memory, storage, database or other medium used in the various embodiments provided in this application may include non-volatile and/or volatile memory. Nonvolatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous chain Road (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. Module completion, that is, dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the present invention. within the scope of protection.

Claims (10)

1. an anti-interference method for Beidou short message, is characterized in that, described method comprises: Obtain the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna; Calculate the signal transmitted by the Beidou short message antenna after compensation according to the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna; The signal received by the GPS antenna is subjected to Beidou short message interference suppression by using the signal transmitted by the compensated Beidou short message antenna, so as to obtain a GPS signal that is resistant to Beidou short message interference. 2. Beidou short message anti-jamming method according to claim 1, is characterized in that, the signal that described GPS antenna receives is expressed as: w ₂ (n)=u(n)+βv(n-τ)+e(n) The Beidou short message signal transmitted by the Beidou short message antenna is expressed as: w ₁ (n)=v(n) Among them, v(n) is the Beidou short message signal, u(n) is the GPS navigation satellite signal, β is the amplitude attenuation factor, τ is the time delay, and e(n) contains noise and satellite signals with an elevation angle less than 10°. 3. The anti-interference method for Beidou short messages according to claim 2, wherein the method further comprises: Get time delay estimates

According to the time delay estimate

Delay time compensation is performed on the Beidou short message signal transmitted by the Beidou short message antenna, and the Beidou short message signal after the delay time compensation is:

. 4. The anti-interference method for Beidou short messages according to claim 3, wherein the method further comprises: Calculate the estimated value of the amplitude attenuation factor according to the Beidou short message signal after the delay time compensation and the signal received by the GPS antenna

5. The Beidou short message anti-jamming method according to claim 4, wherein the signal transmitted by the Beidou short message antenna after the compensation is:

The GPS signal for anti-Beidou short message interference is:

in,

is the residual noise after cancellation. 6. The Beidou short message anti-jamming method according to claim 4, wherein the estimated value of the amplitude attenuation factor

Obtained by solving the following least squares problem:

make: w ₂ =[w ₂ (0),w ₂ (1),...,w ₂ (N-1)] ^T

Then the above formula can be expressed as:

Solving the least squares problem of the above formula, the estimated value of the amplitude attenuation factor can be obtained as:

7. A Beidou short message anti-jamming device, characterized in that the device comprises: The acquisition module is used to acquire the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna; a calculation module, used for calculating the signal transmitted by the Beidou short message antenna after compensation according to the signal received by the GPS antenna and the Beidou short message signal transmitted by the Beidou short message antenna; The compensation module is used for suppressing the interference of Beidou short message on the signal received by the GPS antenna through the signal transmitted by the compensated Beidou short message antenna, so as to obtain a GPS signal that is resistant to the interference of the Beidou short message. 8. The Beidou short message anti-jamming device according to claim 7, wherein the signal received by the GPS antenna is expressed as: w ₂ (n)=u(n)+βv(n-τ)+e(n) The Beidou short message signal transmitted by the Beidou short message antenna is expressed as: w ₁ (n)=v(n) Among them, v(n) is the Beidou short message signal, u(n) is the GPS navigation satellite signal, β is the amplitude attenuation factor, τ is the time delay, and e(n) contains noise and satellite signals with an elevation angle less than 10°. 9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the computer program as claimed in the claims The Beidou short message anti-jamming method described in any one of 1 to 6. 10. A computer-readable storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, the Beidou short message as described in any one of claims 1 to 6 is realized. Anti-interference method.

Images