Optimization suppression method for FMCW radar transmit-receive leakage and static clutter
A radar transceiver and clutter technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as mixer leakage, uncompensated antenna coupling, difficult to filter out, etc., to improve detection capabilities, improve detection effects, and signal-to-noise than the effect of lifting
Pending Publication Date: 2022-02-11
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
[0002] Currently, there are two methods for the transmission and reception leakage of FMCW radar, radio frequency cancellation and intermediate frequency compensation. However, radio frequency cancellation usually can only suppress the leakage of 1 to 2 frequency points, and cannot achieve broadband, while intermediate frequency compensation only compensates for modulation. The leakage of the signal cannot compensate for other components such as antenna coupling leakage, mixer leakage, etc.
Traditionally, digital filtering is generally used to remove ambient clutter, but in short-range detection, the target and environmental clutter are usually very close to each other in frequency spectrum, or even overlap, making it difficult to filter out
Generally speaking, the above traditional technologies can only partially suppress the transmission and reception leakage, or partially suppress the environmental clutter, but cannot fully suppress the transmission and reception leakage and clutter
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[0031] Such as figure 1 As shown, it is the implementation scene of this embodiment, including: FMCW radar composed of transmitting antenna, receiving antenna, radar front end and a kind of FMCW radar transmitting and receiving leakage and static clutter optimization suppression system involved in this embodiment, including: analog subtractor , an analog amplifier, a digital-to-analog converter (ADC), an analog-to-digital converter (DAC) and a microcontroller unit (MCU), wherein: the analog subtractor and the analog amplifier receive the received signal from the FMCW radar, and output it after calibration by analog memory compensation The analog memory compensation signal is sent to the ADC, and the MCU outputs the digital anti-jamming signal to the DAC after the digital memory compensation calibration, and the DAC outputs the analog anti-jamming signal to the analog subtracter to achieve optimal suppression.
[0032] The described analog memory compensation calibration proces...
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An optimal suppression method for FMCW radar transmit-receive leakage and static clutter comprises the following steps: subtracting an analog anti-interference signal generated after analog memory calibration from a real-time intermediate frequency signal in an analog domain and performing amplifying to achieve analog memory compensation; and carrying out difference processing on a digital anti-interference signal generated after digital memory calibration and a digital intermediate frequency signal which is acquired in real time and is subjected to analog memory compensation in a digital domain to achieve digital memory compensation, so as to finally realize depth compensation on transmit-receive leakage and static clutter. According to the invention, based on the characteristic that thetransmit-receive leakage and the environment clutter of the FMCW radar are superposed on the intermediate frequency signal, the analog memory feedback compensation and the digital memory feedback compensation are carried out on the intermediate frequency signal, so that the simultaneous, comprehensive and deep suppression of the transmit-receive leakage and the environment clutter is achieved.
Description
technical field [0001] The present invention relates to a technology in the field of frequency modulated continuous wave radar (FMCW) detection, in particular to an optimized suppression based on digital-analog hybrid memory compensation for the transmission and reception leakage and static clutter faced by FMCW radar in short-range detection method. Background technique [0002] Currently, there are two methods for the transmission and reception leakage of FMCW radar, radio frequency cancellation and intermediate frequency compensation. However, radio frequency cancellation usually can only suppress the leakage of 1 to 2 frequency points, and cannot achieve broadband, while intermediate frequency compensation only compensates for modulation. Signal leakage cannot compensate for other components such as antenna coupling leakage, mixer leakage, etc. Traditionally, digital filtering is generally used to remove ambient clutter. However, in short-range detection, the target and...
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IPC IPC(8): G01S7/36G01S7/02
CPCG01S7/36G01S7/023
Inventor 顾昌展刘劲涛毛军发
Owner SHANGHAI JIAO TONG UNIV