A radio frequency component circuit system and method for short-range blind-zone-free detection

Abstract

This invention discloses a radio frequency (RF) component circuit system and method for short-range, blind-spot-free detection, comprising: a first signal receiving module, a second signal receiving module, a first signal transmitting module, a second signal transmitting module, a mixer circuit module, a local oscillator synthesis circuit module, and an intermediate frequency (IF) filtering and gain circuit module. This invention employs two separate transmitting and receiving branches, achieving 360° panoramic detection capability for the RF component; it utilizes a phase-locked loop (PLL) circuit to generate a fast triangular wave signal for output to the VCO circuit, avoiding triangular wave harmonic leakage during mixing when an external triangular wave signal is applied, ensuring that the demodulated triangular wave harmonic signal is within the IF signal band; and it employs a low-pass filter circuit, a high-pass filter circuit, and an equalization suppression circuit to perform zero-frequency suppression on the demodulated IF signal, enabling the RF component to have a short-range detection capability of 0m to 3m.

Description

Technical Field

[0001] This invention belongs to the field of millimeter proximity fuse technology, specifically relating to a radio frequency component circuit system and method for short-range blind-zone-free detection. Background Technology

[0002] The radio frequency (RF) component circuit is a crucial part of proximity fuses, and millimeter-wave linear frequency modulation (LFM) proximity fuses are widely used. Currently, traditional LFM RF components employ a single transmitter and receiver configuration, which cannot achieve 360° panoramic detection. Furthermore, in the case of triangular wave modulation, triangular wave harmonic leakage prevents the realization of short-range detection from 0m to 3m. Summary of the Invention

[0003] In order to achieve 360° panoramic and near-range blind-zone-free detection by zero-frequency suppression of intermediate frequency signals without linear spectrum shifting in linear frequency modulation and triangular wave modulation modes, this invention proposes a radio frequency component circuit system and method for near-range blind-zone-free detection.

[0004] A radio frequency component circuit system for short-range blind-zone-free detection, which achieves one of the objectives of the present invention, includes: a first signal receiving module, a second signal receiving module, a first signal transmitting module, a second signal transmitting module, a mixer circuit module, an intermediate frequency filtering and gain circuit module, and a local oscillator synthesis circuit module;

[0005] Both the first signal receiving module and the second signal receiving module are used to amplify and suppress noise in the received radio frequency echo signal, and both the first signal transmitting module and the second signal transmitting module are used to amplify and filter the transmitted radio frequency bandwidth signal.

[0006] The first signal receiving module, the second signal receiving module, the first signal transmitting module, and the second signal transmitting module form two sets of transmitting circuits and two sets of receiving circuits to achieve 360° panoramic detection;

[0007] The local oscillator synthesis circuit module is used to generate radio frequency bandwidth signals, which are respectively sent to the first signal transmission module, the second signal transmission module and the mixer circuit module;

[0008] The mixing circuit module is used to demodulate the intermediate frequency signal from the received radio frequency echo signal and the radio frequency bandwidth signal generated by the local oscillator synthesis circuit module, and send it to the intermediate frequency filtering and gain circuit module.

[0009] The intermediate frequency filtering and gain circuit module is used to filter, amplify, and suppress zero-frequency signals.

[0010] Furthermore, the first signal receiving module includes a first receiving antenna, and the second signal receiving module includes a second receiving antenna; the first signal transmitting module includes a first transmitting antenna, and the second signal transmitting module includes a second transmitting antenna; the first receiving antenna and the second receiving antenna are 180° apart; the first transmitting antenna and the second transmitting antenna are 180° apart; the first receiving antenna and the second transmitting antenna are 90° apart; the first receiving antenna and the second transmitting antenna are 90° apart.

[0011] Furthermore, the first signal receiving module includes a first low-noise amplifier circuit, and the radio frequency echo signal received by the first receiving antenna is amplified by the first low-noise amplifier circuit and then output to the mixer circuit module.

[0012] Furthermore, the second signal receiving module includes a second low-noise amplifier circuit, and the radio frequency echo signal received by the second receiving antenna is amplified by the second low-noise amplifier circuit and then output to the mixer circuit module.

[0013] Furthermore, it also includes a power combining circuit module, which combines the two signals output from the first signal receiving module and the second signal receiving module into one signal before outputting it to the mixer circuit module.

[0014] Furthermore, the first signal transmitting module also includes a first radio frequency filter circuit and a first power amplifier circuit; the first power amplifier circuit amplifies the signal to be transmitted and outputs it to the first radio frequency filter circuit, and the first radio frequency filter circuit performs bandpass filtering on the received signal and then sends it to the first transmitting antenna;

[0015] Furthermore, the second signal transmitting module includes a second radio frequency filter circuit and a second power amplifier circuit; the second power amplifier circuit amplifies the signal to be transmitted and outputs it to the second radio frequency filter circuit, and the second radio frequency filter circuit performs bandpass filtering on the received signal and then sends it to the second transmitting antenna.

[0016] Furthermore, the intermediate frequency filtering and gain circuit module includes a low-pass filter circuit, an operational amplifier circuit, a high-pass filter circuit, and an equalization suppression circuit; the signal input terminal of the low-pass filter circuit is connected to the signal output terminal of the mixer circuit module, the signal output terminal of the low-pass filter circuit is connected to the signal input terminal of the operational amplifier circuit, the signal output terminal of the operational amplifier circuit is connected to the signal input terminal of the high-pass filter circuit, and the signal output terminal of the high-pass filter circuit is connected to the signal input terminal of the equalization suppression circuit.

[0017] The low-pass filter circuit performs low-pass filtering on the intermediate frequency signal input to the mixer circuit module and outputs it to the operational amplifier circuit. The operational amplifier circuit amplifies the input signal and outputs it to the high-pass filter circuit. The high-pass filter circuit performs high-pass filtering on the input signal and outputs it to the equalization suppression circuit. The equalization suppression circuit performs zero-frequency suppression on the input signal and finally outputs it to the signal processing component for identification and processing of the detected signal.

[0018] Furthermore, the power input terminal of the operational amplifier circuit is connected to a third power supply circuit.

[0019] Furthermore, the local oscillator synthesis circuit module includes a signal generation circuit, a VCO circuit, and a frequency multiplier circuit; the signal generation circuit is used to generate a fast triangular wave signal; the VCO circuit is used to generate a bandwidth signal by applying a fast triangular wave signal to the voltage-controlled oscillator; the frequency multiplier circuit is used to multiply the bandwidth signal generated by the VCO circuit to generate an RF bandwidth signal.

[0020] Furthermore, the signal generation circuit includes a phase-locked loop circuit and a microcontroller circuit. The microcontroller circuit programs the phase-locked loop circuit in software to generate agile triangular wave signals.

[0021] Furthermore, it also includes a first power divider circuit, which is used to divide the radio frequency bandwidth signal output by the signal generation circuit into two paths, one of which is output to the mixer circuit module, and the other is output to the first signal transmission module and the second signal transmission module.

[0022] Furthermore, it also includes a second power divider circuit, which is used to divide the RF bandwidth signal output by the first power divider circuit into two paths, which are respectively output to the first power amplifier circuit in the first signal transmitting module and the second power amplifier circuit in the second signal transmitting module.

[0023] A method for achieving the second objective of this invention—a radio frequency component circuit for near-range blind-zone-free detection—comprising the following steps:

[0024] S1. The RF bandwidth signal generated by the local oscillator synthesis circuit module is sent to the mixer circuit and the second power divider circuit after passing through the first power divider circuit.

[0025] S2, the second power divider circuit sends the input RF bandwidth signal to the first power amplifier circuit in the first signal transmitting module and the second power amplifier circuit in the second signal transmitting module respectively; the first power amplifier circuit and the second power amplifier circuit amplify the input signal and send it to the first RF filter circuit and the second RF filter circuit respectively; the first RF filter circuit and the second RF filter circuit use RF bandpass filters to send the signal to the first transmitting antenna and the second transmitting antenna, and then radiate the RF bandwidth signal.

[0026] S3. After the radio frequency echo signals are received by the first receiving antenna and the second receiving antenna, they are sent to the first low noise amplifier circuit and the second low noise amplifier circuit for amplification. The amplified radio frequency echo signals are sent to the power combining circuit to combine them into one signal and then sent to the mixer circuit module.

[0027] S4, the mixer circuit module demodulates the RF echo signal and the RF bandwidth signal generated by the local oscillator synthesis circuit module to obtain the intermediate frequency signal, and then outputs it to the low-pass filter circuit; the low-pass filter circuit performs low-pass filtering on the intermediate frequency signal, and after amplification by the operational amplifier circuit, it is sent to the high-pass filter circuit; the high-pass filter circuit performs high-pass filtering on the intermediate frequency signal, and then sends it to the equalization suppression circuit; the equalization suppression circuit performs zero-frequency suppression on the intermediate frequency signal and finally outputs it to the signal processing component to identify and process the detected signal.

[0028] Beneficial effects:

[0029] (1) The present invention employs two separate transmitting and receiving branches to achieve 360° panoramic detection capability of the radio frequency components;

[0030] (2) The present invention uses a phase-locked loop circuit to generate a fast triangular wave signal and output it to the VCO circuit, which avoids the leakage of triangular wave harmonics in the mixing when an external triangular wave signal is applied, so that the demodulated triangular wave harmonic signal is within the intermediate frequency signal band.

[0031] (3) The present invention employs a low-pass filter circuit, a high-pass filter circuit, and an equalization suppression circuit to perform zero-frequency suppression on the demodulated intermediate frequency signal, so that the radio frequency component has a short-range detection capability of 0m to 3m. Attached Figure Description

[0032] Figure 1 This is the radio frequency component circuit for short-range blind-spot-free detection described in this invention. Detailed Implementation

[0033] The following detailed embodiments are provided to explain the technical solutions of the claims of this invention, so that those skilled in the art can understand the claims. The scope of protection of this invention is not limited to the following specific embodiments. Any modifications made by those skilled in the art that incorporate the technical solutions of the claims but differ from the following detailed embodiments are also within the scope of protection of this invention.

[0034] In the description of this invention, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] The present invention will now be described in detail with reference to the accompanying drawings.

[0036] like Figure 1As shown, the radio frequency component circuit in this embodiment includes: a first signal receiving module 1, a second signal receiving module 2, a first signal transmitting module 3, a second signal transmitting module 4, a mixer circuit module 6, an intermediate frequency filtering and gain circuit module 7, and a local oscillator synthesis circuit module 8;

[0037] The first signal receiving module 1 and the second signal receiving module 2 are used to amplify the radio frequency echo signal and suppress the noise signal; the first signal transmitting module 3 and the second signal transmitting module 4 are used to amplify and filter the radio frequency bandwidth signal.

[0038] The first signal receiving module 1 includes a first receiving antenna 11, and the second signal receiving module 2 includes a second receiving antenna 21; the first signal transmitting module 3 includes a first transmitting antenna 31, and the second signal transmitting module 4 includes a second transmitting antenna 41; wherein the first receiving antenna 11, the second receiving antenna 21, the first transmitting antenna 31, and the second transmitting antenna 41 are all SIW microstrip slot antennas, and their installation positions are such that the first receiving antenna 11 and the second receiving antenna 21 are 180° apart, the first transmitting antenna 31 and the second transmitting antenna 41 are 180° apart, the first receiving antenna 11 is 90° apart from the first transmitting antenna 31 and the second transmitting antenna 41, and the second receiving antenna 21 is 90° apart from the first transmitting antenna 31 and the second transmitting antenna 41, thereby realizing 360° panoramic detection of the radio frequency components.

[0039] The mixer circuit module 6 includes a mixer circuit 61, whose first signal input terminal is connected to the power combining circuit 51, its second signal input terminal is connected to the first power dividing circuit 52, and its signal output terminal is connected to the low-pass filter circuit 71 in the intermediate frequency filtering and gain circuit module 7; the intermediate frequency signal is demodulated from the radio frequency echo signal received from the power combining circuit 51 and the radio frequency bandwidth signal received from the first power dividing circuit 52, and then sent to the intermediate frequency filtering and gain circuit module 7.

[0040] The intermediate frequency (IF) filtering and gain circuit module 7 is used to filter, amplify, and suppress zero-frequency signals output from the mixer circuit module 6. It includes a low-pass filter circuit 71, an operational amplifier circuit 73, a high-pass filter circuit 74, and an equalization suppression circuit 75. The signal input of the low-pass filter circuit 71 is connected to the signal output of the mixer circuit module 7, and the signal output of the low-pass filter circuit 71 is connected to the signal input of the operational amplifier circuit 73. The signal output of the operational amplifier circuit 73 is connected to the signal input of the high-pass filter circuit 74. The signal output of the high-pass filter circuit 74 is connected to the signal input of the equalization suppression circuit 75. The equalization suppression circuit 75 performs zero-frequency suppression on the input signal and finally outputs it to the signal processing component.

[0041] Preferably, it further includes a power combining circuit 51, a first power dividing circuit 52, and a second power dividing circuit 53; the power combining circuit 51 is used to combine the two processed radio frequency echo signals into one; the first power dividing circuit 52 and the second power dividing circuit 53 are used to divide the received signal into two paths.

[0042] Local oscillator synthesis circuit module 8 includes signal generation circuit 80, VCO circuit 84 and frequency multiplier circuit 86;

[0043] The signal generation circuit 80 includes a microcontroller circuit 81 and a phase-locked loop circuit 82. The microcontroller circuit 81 uses a single-chip microcomputer C8051F330. The phase-locked loop circuit 82 ADF4159CCPZ is programmed via SIP port to generate a 20kHz agile triangular wave and a 40kHz synchronization signal. The 20kHz triangular wave is applied to the VCO voltage-controlled oscillator HMC510LP5 to generate a bandwidth signal. After passing through the quadruple frequency multiplier MWX007 in the frequency multiplier circuit 86, a Ka-band RF bandwidth signal is generated. This signal is then divided into two paths by the power divider in the first power divider circuit 52. One path is output to the mixer 61 in the mixer circuit module 6, and the other path is output to the input of the power divider in the second power divider circuit 52.

[0044] The RF bandwidth signal is transmitted to the first power amplifier circuit 33 and the second power amplifier circuit 43 respectively through the power divider in the second power divider circuit 53. The first power amplifier circuit 33 amplifies the signal by 14dB gain through the power amplifier NC10240C-3240 and then transmits it to the first RF filter circuit 34. The first RF filter circuit 34 uses the RF bandpass filter NC6627C-3436 to transmit the signal to the first transmitting antenna 31, and the first transmitting antenna 31 radiates the RF bandwidth signal. The second power amplifier circuit 43 amplifies the signal by 14dB gain through the power amplifier NC10240C-3240 and then transmits it to the second RF filter circuit 44. The second RF filter circuit 44 uses the RF bandpass filter NC6627C-3436 to transmit the signal to the second transmitting antenna 41, and the second transmitting antenna 41 radiates the RF bandwidth signal.

[0045] The radio frequency echo signals are received by the first receiving antenna 11 and the second receiving antenna 21, respectively. The first receiving antenna 11 transmits the echo signal to the first low-noise amplifier circuit 13. The first low-noise amplifier circuit 13 amplifies the echo signal by 20dB after passing through the low-noise amplifier NC10246C-3337, and then transmits it to the power combining circuit 51. The second receiving antenna 21 transmits the radio frequency echo signal to the second low-noise amplifier circuit 23. The second low-noise amplifier circuit 23 amplifies the radio frequency echo signal by 20dB after passing through the low-noise amplifier NC10246C-3337, and then transmits it to the power combining circuit 51.

[0046] The power combiner circuit 51 uses a microstrip power combiner. The power combiner circuit 51 sends the echo information to the mixer circuit 61 in the mixer circuit module 6. The mixer circuit 61 uses the mixer NC17003C-2440 to mix the radio frequency echo signal and the local oscillator signal and then outputs the intermediate frequency to the low-pass filter circuit 71.

[0047] The low-pass filter circuit 71 uses the low-pass filter NC6618C-095 to perform low-pass filtering on the intermediate frequency signal. The filtered intermediate frequency signal is output to the operational amplifier circuit 73. The operational amplifier circuit 73 uses a two-stage amplifier NBB-500 to amplify the intermediate frequency signal by 40dB before sending it to the high-pass filter circuit 74 for high-pass filtering. The filtered intermediate frequency signal is finally output after passing through the equalization suppression circuit 75.

[0048] Both the high-pass filter circuit 74 and the equalization suppression circuit 75 are composed of LC circuits. Their function is to suppress the intermediate frequency signal at zero frequency, so that the flatness response in the intermediate frequency band is less than 5dB.

[0049] This application also provides a method for a radio frequency component circuit for short-range blind-zone-free detection, the steps of which are as follows:

[0050] S1. The radio frequency bandwidth signal generated by the local oscillator synthesis circuit module 8 is sent to the mixer circuit module 6 and the second power divider circuit 53 after passing through the first power divider circuit 52.

[0051] S2, the second power divider circuit 53 sends the input RF bandwidth signal to the first power amplifier circuit 33 in the first signal transmitting module 3 and the second power amplifier circuit 43 in the second signal transmitting module 4 respectively; the first power amplifier circuit 33 and the second power amplifier circuit 43 amplify the input signal and send it to the first RF filter circuit 33 and the second RF filter circuit 43 respectively; the first RF filter circuit 33 and the second RF filter circuit 43 use RF bandpass filters to send the signal to the first transmitting antenna 31 and the second transmitting antenna 41 and then radiate the RF bandwidth signal.

[0052] S3. After the radio frequency echo signal is received by the first receiving antenna 11 and the second receiving antenna 21, it is sent to the first low noise amplifier circuit 13 and the second low noise amplifier circuit 23 for amplification. The amplified radio frequency echo signal is sent to the power combining circuit 51 to combine into one signal and then sent to the mixer circuit module 6.

[0053] S4, the mixing circuit module 6 demodulates the RF echo signal and the RF bandwidth signal generated by the local oscillator synthesis circuit module 8 to obtain the intermediate frequency signal, and then outputs it to the low-pass filter circuit 71; the low-pass filter circuit 71 performs low-pass filtering on the intermediate frequency signal, and after being amplified by the operational amplifier circuit 73, it is sent to the high-pass filter circuit 74; the high-pass filter circuit 74 performs high-pass filtering on the intermediate frequency signal and then sends it to the equalization suppression circuit 75; the equalization suppression circuit 75 performs zero-frequency suppression on the intermediate frequency signal and finally outputs it.

[0054] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0055] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A radio frequency assembly circuitry for short range blind area free detection, characterized by, include: The system comprises a first signal receiving module (1), a second signal receiving module (2), a first signal transmitting module (3), a second signal transmitting module (4), a mixer circuit module (6), an intermediate frequency filtering and gain circuit module (7), and a local oscillator synthesis circuit module (8). The first signal receiving module (1) and the second signal receiving module (2) are both used to amplify and suppress noise in the received radio frequency echo signal, and the first signal transmitting module (3) and the second signal transmitting module (4) are both used to amplify and filter the radio frequency bandwidth signal to be transmitted. The local oscillator synthesis circuit module (8) is used to generate radio frequency bandwidth signals, which are respectively sent to the first signal transmitting module (3), the second signal transmitting module (4) and the mixer circuit module (6). The mixing circuit module (6) is used to demodulate the intermediate frequency signal from the received radio frequency echo signal and the radio frequency bandwidth signal generated by the local oscillator synthesis circuit module (8), and send it to the intermediate frequency filtering and gain circuit module (7). The intermediate frequency filtering and gain circuit module (7) is used to filter, amplify and suppress zero frequency signals output by the mixing circuit module (6); The local oscillator synthesis circuit module (8) includes a signal generation module (80), a VCO circuit (84), and a frequency multiplier circuit (86). The signal generation module (80) is used to generate agile triangular wave signals; the VCO circuit (84) is used to generate bandwidth signals by applying an agile triangular wave signal to the voltage-controlled oscillator; the frequency multiplier circuit (86) is used to multiply the bandwidth signals generated by the VCO circuit (84) to generate radio frequency bandwidth signals. The signal generation module (80) includes a phase-locked loop circuit (82) and a microcontroller circuit (81). The microcontroller circuit (81) performs software programming on the phase-locked loop circuit (82) to generate agile triangular wave signals. The microcontroller circuit (81) uses a single-chip microcomputer to program the phase-locked loop circuit (82) through the SIP port to generate a 20KHz agile triangular wave and a 40KHz synchronization signal. The 20KHz triangular wave is applied to the VCO voltage-controlled oscillator HMC510LP5 to generate a bandwidth signal. After passing through the quadruple frequency multiplier MWX007 in the frequency multiplier circuit (86), a Ka-band RF bandwidth signal is generated. After passing through the power divider in the first power divider circuit (52), it is divided into two paths. One path is output to the mixer circuit (61) in the mixer circuit module (6), and the other path is output to the input of the power divider in the second power divider circuit (53).

2. The radio frequency component circuit system for short-range blind-spot-free detection as described in claim 1, characterized in that, The first signal receiving module (1) includes a first receiving antenna (11), and the second signal receiving module (2) includes a second receiving antenna (21); the first signal transmitting module (3) includes a first transmitting antenna (31), and the second signal transmitting module (4) includes a second transmitting antenna (41); the first receiving antenna (11) and the second receiving antenna (21) are 180° apart; the first transmitting antenna (31) and the second transmitting antenna (41) are 180° apart; the first receiving antenna (11) is 90° apart from the first transmitting antenna (31) and the second transmitting antenna (41); the second receiving antenna (21) is 90° apart from the first transmitting antenna (31) and the second transmitting antenna (41).

3. The radio frequency component circuit system for short-range blind-zone-free detection as described in claim 1, characterized in that, The intermediate frequency filtering and gain circuit module (7) includes a low-pass filter circuit (71), an operational amplifier circuit (73), a high-pass filter circuit (74), and an equalization suppression circuit (75). The signal input terminal of the low-pass filter circuit (71) is connected to the signal output terminal of the mixer circuit module (6), the signal output terminal of the low-pass filter circuit (71) is connected to the signal input terminal of the operational amplifier circuit (73), and the signal output terminal of the operational amplifier circuit (73) is connected to the signal input terminal of the high-pass filter circuit (74). The signal output terminal of the high-pass filter circuit (74) is connected to the signal input terminal of the equalization suppression circuit (75), and the equalization suppression circuit (75) performs zero-frequency suppression on the input signal and then outputs the final signal.

4. The radio frequency component circuit system for short-range blind-spot-free detection as described in claim 1, characterized in that, It also includes a first power divider circuit (52), which is used to divide the radio frequency bandwidth signal output by the local oscillator synthesis circuit module (8) into two paths, one path is output to the mixer circuit module (6), and the other path is output to the first signal transmission module (3) and the second signal transmission module (4).

5. The radio frequency component circuit system for short-range blind-zone-free detection as described in claim 4, characterized in that, It also includes a second power divider circuit (53), which is used to divide the radio frequency bandwidth signal output by the first power divider circuit (52) into two paths and output them to the first power amplifier circuit (33) in the first signal transmitting module (3) and the second power amplifier circuit (43) in the second signal transmitting module (4), respectively.

6. The radio frequency component circuit system for short-range blind-spot-free detection as described in claim 1, characterized in that, The first signal receiving module (1) includes a first low-noise amplifier circuit (13). The radio frequency echo signal received by the first receiving antenna (11) is amplified by the first low-noise amplifier circuit (13) and then output to the mixing circuit module (6). The second signal receiving module (2) includes a second low-noise amplifier circuit (23). The radio frequency echo signal received by the second receiving antenna (21) is amplified by the second low-noise amplifier circuit (23) and then output to the mixing circuit module (6).

7. The radio frequency component circuit system for short-range blind-zone-free detection as described in claim 1, characterized in that, The first signal transmitting module (3) includes a first radio frequency filter circuit (34) and a first power amplifier circuit (33); the first power amplifier circuit (33) amplifies the signal to be transmitted and outputs it to the first radio frequency filter circuit (34), and the first radio frequency filter circuit (34) performs bandpass filtering on the received signal and sends it to the first transmitting antenna (31); the second signal transmitting module (4) includes a second radio frequency filter circuit (44) and a second power amplifier circuit (43); the second power amplifier circuit (43) amplifies the signal to be transmitted and outputs it to the second radio frequency filter circuit (44), and the second radio frequency filter circuit (44) performs bandpass filtering on the received signal and sends it to the second transmitting antenna (41).

8. A control method applied to the circuit system of claim 1, comprising the following steps: S1. The radio frequency bandwidth signal generated by the local oscillator synthesis circuit module (8) is sent to the mixer circuit module (6) and the second power divider circuit (53) after passing through the first power divider circuit (52). S2, the second power divider circuit (53) sends the input RF bandwidth signal to the first power amplifier circuit (33) in the first signal transmitting module (3) and the second power amplifier circuit (43) in the second signal transmitting module (4), respectively; the first power amplifier circuit (33) and the second power amplifier circuit (43) amplify the input signal and send it to the first RF filter circuit (34) and the second RF filter circuit (44), respectively; the first RF filter circuit (34) and the second RF filter circuit (44) use RF bandpass filters to send the signal to the first transmitting antenna (31) and the second transmitting antenna (41) and then radiate the RF bandwidth signal. S3. After the radio frequency echo signal is received by the first receiving antenna (11) and the second receiving antenna (21), it is sent to the first low noise amplifier circuit (13) and the second low noise amplifier circuit (23) for amplification. The amplified radio frequency echo signal is sent to the power combining circuit (51) to combine into one signal and then sent to the mixer circuit module (6). S4. The mixing circuit module (6) demodulates the RF echo signal and the RF bandwidth signal generated by the local oscillator synthesis circuit module (8) to produce an intermediate frequency signal, which is then output to the low-pass filter circuit (71). The low-pass filter circuit (71) performs low-pass filtering on the intermediate frequency signal, which is then amplified by the operational amplifier circuit (73) and sent to the high-pass filter circuit (74). The high-pass filter circuit (74) performs high-pass filtering on the intermediate frequency signal and sends it to the equalization suppression circuit (75). The equalization suppression circuit (75) performs zero-frequency suppression on the intermediate frequency signal and finally outputs it.

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