A multi-path suppression method for multi-target side walls after through-wall radar imaging

Abstract

The present invention discloses a multi-target side wall one-time multipath suppression method suitable for through-wall radar imaging. First, all connected domains are extracted from binary original radar images by using a 4-connected domain detection method; Their average coordinates are sorted in ascending order of the Euclidean distance from the center of the radar array to obtain the connected domain vector; then, the elements of the connected domain vector are reorganized into two sub-vectors, and the two sub-vectors are respectively divided according to the multipath transmission path to the radar and the direct echo transmission path Expand; then use the similarity function to calculate the similarity matrix of the two sub-vectors; finally use the similarity threshold and judgment rules to determine all the elements of the similarity matrix, get the connected domain where the real target is located and suppress the multipath false target . The invention can detect hidden multi-targets behind the wall, and can effectively eliminate multi-paths while retaining the targets.

Description

technical field [0001] The invention relates to the technical field of through-wall radar imaging, in particular to a method for suppressing a multipath false target when a part of a target overlaps with a side wall of another target. Background technique [0002] Through-the-wall radar imaging technology mainly uses electromagnetic waves to penetrate obstacles such as building walls to detect, locate and identify hidden targets in airtight buildings, and at the same time image the layout of buildings. It has great application value. When electromagnetic waves propagate in a closed building environment, there are many different propagation paths. Among them, the path from the transmitting radar to the target and then directly reflected back to the receiving radar is called the direct path. After the radar is launched, it will reflect one or more times on the surface of the wall and then reflect back to the receiving radar through the target, or hit the target first, then re...

AI Technical Summary

Problems solved by technology

The above method can only deal with a single target scene, or a scene where there is no overlap between the multipath and the target. When dealing with a multi-target scene where the target and the multipath false target overlap, the above method will cause real Missing target, missing alarm

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