A Radar Multipath Target Elimination Method Based on Micro-Doppler Feature

Abstract

The invention discloses a radar multipath target elimination method based on micro-Doppler features. The steps include: S1. When the radar performs target detection, respectively extract the micro-Doppler features of all targets detected by the radar; S2. Compare the targets The similarity between the corresponding micro-Doppler features, if the micro-Doppler features of two targets are similar, it is determined that there are multi-path targets in the two targets, and the parameters of the two targets are obtained for comparison to find The multipath targets therein; S3. Eliminate all the multipath targets found in step S2 to obtain the final radar target detection result. The invention can eliminate multipath false targets in radar detection, and has the advantages of simple operation, low cost, high elimination efficiency and precision.

Description

technical field [0001] The invention relates to the technical field of radar target detection, in particular to a radar multipath target elimination method based on micro-Doppler features. Background technique [0002] When the radar is used for target detection, the radar transmitter first transmits an electromagnetic wave signal with a certain bandwidth to the space. After the electromagnetic wave reaches the detected target, the target will scatter the signal to all directions in the space, and part of the signal will return directly to the radar along the transmitted signal path. The receiver, the radar receiver then extracts the distance, speed, azimuth and other information of the target through a certain signal processing method according to the wave path difference between the transmitted signal and the received signal. like figure 1 As shown, if there are strong reflectors such as walls, tall buildings and metal objects in the environment where the target is locate...

AI Technical Summary

Problems solved by technology

Multipath targets will cause the system to generate false alarms, and even interfere with the detection of real targets, resulting in misjudgment by the radar and seriously affecting the target tracking performance of the radar system. Multipath targets in radar detection must be eliminated.

[0003] Multipath targets usually have echo characteristics similar to real targets, and it is generally difficult to eliminate them using signal processing methods. Therefore, in order to reduce multipath effects, radar systems usually require as few strong reflectors as possible in the surveillance scene, and at the same time meet the requirements of the radar system. Under the premise of measuring indicators, the transmission power should be reduced as much as possible to weaken the signal strength of multiple scattering and achieve the purpose of reducing multipath. However, this type of method can only reduce the generation of multipath targets to a limited extent, and cannot fundamentally solve multipath targets. The interference problem cannot effectively eliminate the multipath targets that have been generated, and it also limits the applicability of the radar and reduces the detection performance of the radar

In order to solve the above problems, some practitioners proposed to use the distribution characteristics of multipath targets to find out multipath targets. Target elimination, but this type of method is usually very complicated to implement and needs to rely on complex data processing, and it is very easy to cause misjudgment based on the size of the amplitude and affect the real target

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