CN112485762A - Dual-frequency radar - Google Patents
Dual-frequency radar Download PDFInfo
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- CN112485762A CN112485762A CN202011094083.7A CN202011094083A CN112485762A CN 112485762 A CN112485762 A CN 112485762A CN 202011094083 A CN202011094083 A CN 202011094083A CN 112485762 A CN112485762 A CN 112485762A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 230000010355 oscillation Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
公开了一种双频雷达，包括主控模块(01)、变频模块(02)、双频发射天线(03)和双频接收天线(04)。主控模块的主频率合成器产生第一频段的电磁波信号。主控模块的耦合器将第一频段的电磁波信号的一路送至双频发射天线发射出去，另一路送至变频模块。变频模块的副频率本振发生器以主控模块的时钟发生器的频率为参考源，产生本振信号。变频模块的发射混频器混合本振信号和第一频段的电磁波信号，产生第二频段的电磁波信号。变频模块的接收混频器将被目标反射回来的第二频段的电磁波信号与本振信号混合，将信号搬移到第一频段，然后送至主控模块处理。本发明的双频雷达达到了第一频段和第二频段完全同步的效果，结构上模块化，易量产，便于扩展。
Disclosed is a dual-frequency radar, comprising a main control module (01), a frequency conversion module (02), a dual-frequency transmitting antenna (03) and a dual-frequency receiving antenna (04). The main frequency synthesizer of the main control module generates the electromagnetic wave signal of the first frequency band. The coupler of the main control module sends one channel of the electromagnetic wave signal of the first frequency band to the dual-frequency transmitting antenna for transmission, and the other channel is sent to the frequency conversion module. The sub-frequency local oscillator generator of the frequency conversion module takes the frequency of the clock generator of the main control module as a reference source to generate a local oscillator signal. The transmitting mixer of the frequency conversion module mixes the local oscillator signal and the electromagnetic wave signal of the first frequency band to generate the electromagnetic wave signal of the second frequency band. The receiving mixer of the frequency conversion module mixes the electromagnetic wave signal of the second frequency band reflected by the target with the local oscillator signal, moves the signal to the first frequency band, and then sends it to the main control module for processing. The dual-frequency radar of the present invention achieves the effect of complete synchronization of the first frequency band and the second frequency band, and is modular in structure, easy to mass-produce, and easy to expand.
Description
Technical Field
The invention relates to a radar, in particular to a radar which can simultaneously generate and emit electromagnetic waves with two different wavelengths.
Background
Microwave radar is an important remote sensing device. Radars of different wavelengths have different characteristics: the radar with high frequency has shorter wavelength, good transmission linearity, smaller antenna size, high imaging resolution and poor penetrability, and is easy to turn over the phase and difficult to unwind due to the short wavelength; and the radar with low frequency (generally referred to as L wave band and below) has longer wavelength, difficult phase overturn and good penetrability, can penetrate vegetation and even earth surface to acquire more accurate information, but needs an antenna with larger size, and has less imaging details and low precision. If the transmitting and receiving devices with different wavelengths can be integrated in one device, the phase relationship between the transmitting and receiving devices can be ensured, and the data of the transmitting and receiving devices and the data of the phase relationship can be processed uniformly, great progress can be brought to remote sensing. The existing dual-frequency radar has a complex structure, two frequency bands are difficult to synchronize, the two frequency bands are difficult to expand, and the cost is high.
Disclosure of Invention
Therefore, the invention provides a dual-frequency radar which can simultaneously generate and emit two electromagnetic waves with different wavelengths, ensure that the initial phases of the two electromagnetic waves are consistent, or the phase difference of the initial phases is controllable or known, and then simultaneously receive and process the two electromagnetic waves with different wavelengths.
At least one embodiment of the invention provides a dual-frequency radar, which comprises a main control module, a frequency conversion module, a dual-frequency transmitting antenna and a dual-frequency receiving antenna.
The master control module comprises: a clock generator; a main frequency synthesizer for generating electromagnetic wave signals of a first frequency band; two receiving channels, which are used as a single-frequency radar for multi-polarization receiving or multi-antenna receiving, or one of the channels is used for receiving electromagnetic wave signals of a first frequency band, and the other channel receives electromagnetic wave signals of a second frequency band converted by the frequency conversion module; the coupler is used for sending one path of the electromagnetic wave signals of the first frequency band to the dual-frequency transmitting antenna to be transmitted, sending the other path of the electromagnetic wave signals to the frequency conversion module, wherein the transmitted electromagnetic wave signals of the first frequency band are received by the dual-frequency receiving antenna after meeting the reflection of a target, and enter one of the two receiving channels; and the main controller is connected with the clock generator, the main frequency synthesizer and the two receiving channels.
The frequency conversion module comprises:
the auxiliary frequency local oscillation generator is used for generating local oscillation signals by taking the frequency of the clock generator as a reference source;
the transmitting mixer is used for mixing the local oscillator signal with the electromagnetic wave signal of the first frequency band sent by the coupler in the main control module so as to generate an electromagnetic wave signal of a second frequency band; and
and the receiving mixer is used for mixing the electromagnetic wave signal of the second frequency band reflected by the target with the local oscillator signal, moving the signal to the first frequency band, and then sending the signal to the other of the two receiving channels of the main control module.
In some examples, the two receive channels are connected to low noise amplifiers that amplify the signals they receive.
In some examples, the main frequency synthesizer is connected with a main frequency power amplifier for amplifying the electromagnetic wave signal of the first frequency band generated by the main frequency synthesizer.
In some examples, a secondary frequency power amplifier is connected to the transmit mixer for amplifying the electromagnetic wave signal in the second frequency band to the dual-frequency transmit antenna.
In some examples, the receiving mixer is connected with a sub-frequency low noise amplifier for amplifying the electromagnetic wave signal of the second frequency band reflected by the target.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
Fig. 1 is a block diagram of a dual-band radar system according to an embodiment of the present invention.
Fig. 2 is a system block diagram of a main control module according to an embodiment of the present invention.
Fig. 3 is a system block diagram of a frequency conversion module according to an embodiment of the present invention.
Detailed Description
The dual-frequency radar can simultaneously generate and emit two electromagnetic waves with different wavelengths, and ensures that the initial phases of the two electromagnetic waves are consistent, or the phase difference of the initial phases is controllable or known. Because the propagation speeds of the electromagnetic waves in the two frequency bands are almost the same, the time for the electromagnetic waves in the two frequency bands to be reflected back when meeting a target is almost the same, the dual-frequency radar needs to simultaneously receive and process the two reflected signals, and the effective information is extracted by combining the two reflected electromagnetic waves.
Fig. 1 is a block diagram of a dual-band radar system according to an embodiment of the present invention. As shown in fig. 1, the dual-band radar includes a main control module 01 and a frequency conversion module 02, as well as a dual-band transmitting antenna 03 and a dual-band receiving antenna 04.
Fig. 2 shows a system block diagram of a master control module 01, the master control module 01 comprising a clock generator 101, a master frequency synthesizer 102, a master controller 103, a signal processor 104, two identical receive channels 105, 106 and corresponding low noise amplifiers 107, 108, a master frequency power amplifier 109 and a coupler 110. Fig. 3 shows a system block diagram of a frequency conversion module 02, and the frequency conversion module 02 comprises a secondary frequency local oscillator generator 201, a transmitting mixer 202, a secondary frequency power amplifier 203, a receiving mixer 204 and a secondary frequency low noise amplifier 205.
The clock generator 101 is responsible for the overall clock generation, ensuring the phase consistency of the system.
The main controller 103 is responsible for controlling the operation of the system, including controlling the main frequency synthesizer 102 to generate the required waveforms, receiving and processing the received signals, sending the signals to the signal processor 104 for pre-processing, and transmitting the processed results to the user computer.
The main frequency synthesizer 102 is controlled by the main controller 103 to generate an electromagnetic wave signal of a main frequency (first frequency band).
The receiving channels 105 and 106 may be configured as needed, and may be used as a single-frequency radar for multi-polarization reception or multi-antenna reception, or one channel may be used to receive a signal in a first frequency band, and the other channel may receive a signal in a second frequency band converted by the frequency conversion module 02.
The main frequency power amplifier 109 is connected to the main frequency synthesizer 102 and amplifies the transmission signal to a sufficient level.
The coupler 110 distributes the signal of the first frequency band out of a RF1 path to the transmit mixer 202 of the frequency conversion module 02 as an RF input, so as to obtain a signal of the second frequency band.
The signal processor 104 is responsible for performing the necessary pre-processing of the received signal.
The frequency of the signal generated by the secondary frequency local oscillator generator 201 is determined by the frequency values of the primary frequency (first frequency band) and the secondary frequency (second frequency band), which may be the difference between the primary frequency and the secondary frequency. The frequency reference source of the secondary frequency local oscillator generator 201 is from the clock generator 104 of the master control module 01 to ensure synchronism.
The transmitting mixer 202 mixes the local oscillation signal generated by the auxiliary frequency local oscillation generator 201 with the signal of the first frequency band generated by the main control module 01, so as to obtain a signal of the second frequency band, and the signal is amplified by the auxiliary frequency power amplifier 203 and then sent to the dual-frequency transmitting antenna 03 for transmission.
The sub-frequency lna 205 amplifies the signal from the dual-frequency receiving antenna 04, and then enters the RF end of the receiving mixer 204, and the receiving mixer 204 mixes the local oscillation signal generated by the sub-frequency local oscillation generator 201 with the signal, shifts the local oscillation signal to the main frequency (first frequency band), and then sends the local oscillation signal to the lna 108 of the receiving channel 106 of the main control module 01.
When the main frequency and the sub frequency range are different, only the frequency of the local oscillation signal generated by the sub frequency local oscillation generator 201 needs to be adjusted.
There are many solutions for the dual-band transmitting antenna 03 and the dual-band receiving antenna 04, which are not described in detail.
In addition, the dual-frequency radar of the present invention further includes conventional radio frequency devices, such as necessary filters, and the like, which are not described in detail.
The specific implementation method will be described below by taking an example in which the primary frequency (first frequency band) is 5300MHz to 5350MHz, and the secondary frequency (second frequency band) is 1250MHz to 1300 MHz.
In the main control module 01, the frequency of the clock generator 101 is 10MHz, and the clock signal not only coordinates the operation of the main control module 01 and serves as the reference frequency of the main frequency synthesizer 102, but also needs to be distributed to the frequency conversion module 02 as the reference frequency of the sub-frequency local oscillation generator 201.
The main controller 103 controls the main frequency synthesizer 102 to generate a 5300MHz to 5350MHz frequency sweep signal with 10MHz as a reference frequency.
The first frequency band swept signal is amplified by the main frequency power amplifier 109 and then divided into three paths by the coupler 110. The first path is sent to the dual-frequency transmitting antenna 03, and after being transmitted through the antenna, the signal of the first path is reflected back when encountering a target, is received by the dual-frequency receiving antenna 04, enters the receiving channel 105 after being filtered, and is sent to a computer after being processed. The second path enters the mixer as the local oscillator of the receiving channel (this path is of conventional design and not described in detail in this invention). The third path is sent to the frequency conversion module 02 as the intermediate frequency input of the transmit mixer 202.
The auxiliary frequency local oscillator generator 201 of the frequency conversion module 02 generates a local oscillator signal of 4050MHz at the reference frequency of 10MHz sent from the Clk port by the clock generator 101 of the main control module 01, and the local oscillator signal is divided into two paths and enters the transmitting mixer 202 and the receiving mixer 204 respectively. The local oscillation signal generated by the local oscillation generator 201 with the secondary frequency is mixed in the transmitting mixer 202, and the first frequency band sweep signal of 5300MHz to 5350MHz sent from the RF1 port by the coupler 110 in the main control module 01, so as to generate a second frequency band sweep signal of 1250MHz to 1300MHz, and the second frequency band sweep signal is amplified by the secondary frequency power amplifier 203 and sent to the dual-frequency transmitting antenna 03. The electromagnetic wave of the second frequency band hits the target and is reflected back, and then is received by the dual-frequency receiving antenna 04, filtered and amplified, and enters the receiving mixer 204. The receiving mixer 204 mixes the signal with the local oscillation signal generated by the auxiliary frequency local oscillation generator 201, moves the signal to the first frequency band (5300MHz to 5350MHz), and then sends the signal to the receiving channel 106 of the main control module 01 (processed by the low noise amplifier 108), and the main control module 01 processes the signal and then sends the signal to the computer.
So far, the generation, transmission, reception, and processing of signals of two frequency bands have been completed.
In order to embody the flexibility advantage of the present invention, it is assumed that the radar is designed to have the first frequency band of 5300MHz-5350MHz, and the second frequency band of 400MHz to 450MHz, only the local oscillation signal frequency generated by the auxiliary frequency local oscillation generator 201 of the frequency conversion module 02 needs to be changed to 4900MHz, and the filter needs to be changed to 400MHz-450 MHz.
And if the first frequency band is 1250MHz to 1300MHz, and the second frequency band is 400MHz to 450MHz, only two frequency conversion modules need to be installed. And compared with the main module, the structure of the frequency conversion module is much simpler and the cost is much lower.
The dual-frequency radar implementation method provided by the invention has the advantages of novel structure and high modularization degree, thereby achieving the effects that the first frequency band and the second frequency band are independently designed and manufactured, the two frequency bands are completely synchronous, the expansion is flexible, the cost is low, and the popularization is facilitated.
Claims (5)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420604A (en) * | 2023-12-19 | 2024-01-19 | 上海高晶检测科技股份有限公司 | Metal detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420604A (en) * | 2023-12-19 | 2024-01-19 | 上海高晶检测科技股份有限公司 | Metal detector |
| CN117420604B (en) * | 2023-12-19 | 2024-02-23 | 上海高晶检测科技股份有限公司 | Metal detector |
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