Front and back wall oscillation multipath one-time suppression method after multiple-input multiple-output through-the-wall radar imaging

Abstract

The invention discloses a front and back wall oscillation multipath one-time suppression method after multiple-input multiple-output through-the-wall radar imaging. The front and back wall oscillationmultipath one-time suppression method after multiple-input multiple-output through-the-wall radar imaging includes the steps: after obtaining an original radar image, performing binaryzation on the original radar image, extracting the central values of all the targets in the original image, calculating the direct propagation distance and the multi-path propagation distance of the target electromagnetic wave, calculating eh normalization multipath error coefficient and error threshold so as to determine the target of the original image, and finally rejecting the multipath false target to realize multipath suppression and realize effective identification of the real targets in the radar image and two front and back wall oscillation one time multipath false targets in the radar image. Therefore, the front and back wall oscillation multipath one-time suppression method after multiple-input multiple-output through-the-wall radar imaging can suppress multipath false targets while causing noloss of real targets, can completely consider two different multipath forms in one way multipath at the same time, can realize comprehensive and complete multipath suppression without leakage, can guarantee the practical effect in a sealed building detection environment of the through-the-wall radar, and can provide powerful guarantee for the operator to make correct decisions.

Description

technical field [0001] The invention belongs to the technical field of through-wall radar imaging, and in particular relates to a multi-path suppression method for front and rear wall oscillation once after multi-input and multi-receive through-wall radar imaging. 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 stationary or moving targets in closed buildings, and at the same time image the layout of buildings. , Disaster rescue and other fields have great application value. Ideally, when the through-wall radar detects a confined space, the emitted electromagnetic wave signal returns to the receiver only after being backscattered by the target, so the echo signal received by the receiver only contains the echo signal of the target; but in practice In the application, the signal is likely to be refracted or reflected by walls, ceilings or flo...

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Problems solved by technology

[0006] In the multipath suppression of the above methods, the multipath modeling does not take into account that in MIMO radar, the multipath in the transmit and receive paths has different characteristics, and appears as two separate targets during imaging, but only Consider and deal with a single path situation of a class of multipath

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