A Radar Ranging Adaptive Cancellation Method
A radar ranging and self-adaptive technology, applied in the direction of measuring devices, radio wave measuring systems, instruments, etc., can solve the problems of limited radar size, complicated links, and large interference, so as to increase the integration time and improve the intermediate frequency signal signal Noise ratio, the effect of improving the useful signal duty cycle
Active Publication Date: 2022-07-15
HUNAN MAXWELL ELECTRONICS TECH
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Problems solved by technology
[0004] The existing radar technical solutions have the following deficiencies: In the specific use of continuous wave radar, the radar size is limited, the antenna isolation is difficult to achieve, and the near-range interference will be relatively large. Signal provision, which suffers from self-interference problems, is generally solved by the following methods. The software cancellation scheme extracts useful signals through complex algorithms of the software; , the link is relatively complex, and the same bandwidth needs to occupy more frequency resources
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[0041] Example 2, see figure 2 In this embodiment, the signal source is used to simulate the echo signal, the signal is received by the detector in the radar body, and then the signal is divided into two channels through the power divider, and the self-interference signal is transferred to the mixer local oscillator input signal for use Finally, the intermediate frequency filter is filtered and mixed into a zero-frequency self-interference signal. It can be clearly seen from the measured intermediate frequency effect diagram that the useful intermediate frequency signal is much higher than the noise floor, which greatly reduces the signal-to-noise ratio. Compared with traditional software, the Elimination scheme: extract useful signals through a complex algorithm of software; time division scheme: when the transmission and reception are different, time isolation is used to improve the isolation of transmission and reception; transmission and reception of different frequencies:...
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The invention discloses a radar ranging adaptive cancellation method, which is suitable for frequency modulation continuous wave radar. It is difficult to improve the isolation degree of the antenna and the self-interference power is large. Part of the received signal is used for the input of the local oscillator of the mixer. The ranging adaptive cancellation scheme includes S1, signal reception, S2, preliminary cancellation, S3, signal splitting, S4, ranging isometric, S5, secondary cancellation, S6, signal acquisition. The present invention directly adopts the near-end interference signal in the echo signal as the intrinsic by using the characteristics of poor antenna isolation, and the wiring of the two signal ports before the power divider and the mixer is set to be equal in length. The power is too small to be used as the intrinsic drive, and the near-end interference signal is used as the intrinsic, and the near-end interference signal is mixed with zero frequency, which effectively achieves the self-adaptive cancellation of the self-interference signal from the hardware, which can effectively improve the ranging. The signal-to-noise ratio of the IF signal of the radar system, the remaining useful IF signal can be effectively extracted for analysis.
Description
technical field [0001] The invention relates to the technical field of radar anti-jamming, in particular to a radar ranging adaptive cancellation method. Background technique [0002] FM continuous wave radar refers to a continuous wave radar whose emission frequency is modulated by a specific signal, such as a weather radar. FM continuous wave radar obtains the distance information of the target by comparing the difference between the frequency of the echo signal at any time and the frequency of the transmitted signal at this time, and the distance is proportional to the frequency difference between the two. The radial velocity and distance of the target can be obtained by processing the measured frequency difference between the two. Compared with other ranging and speed measuring radars, the structure of FMCW radar is simpler, and the technical experience of FMCW radar is richer. Low, easy to modulate, low cost, simple signal processing, so it is a commonly used radar sys...
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IPC IPC(8): G01S13/08G01S7/36G01S7/41
CPCG01S13/08G01S7/36G01S7/41
Inventor 邓白玉穆雪峰刘健周水源刘涛
Owner HUNAN MAXWELL ELECTRONICS TECH