An imaging method suitable for multipath phantom suppression of through-wall radar

Abstract

The invention provides an imaging method suitable for suppressing multipath phantoms of through-wall radar, which includes a sub-aperture imaging step: dividing the full aperture into N sub-apertures without intersection; Obtain N independent sub-images; sub-image fusion step: carry out normalization processing to N independent sub-images respectively, obtain N normalized sub-images I'i; carry out connection for N normalized sub-images Multiply to obtain the fused image If; finally, perform threshold detection and binarization processing on the fused image If to obtain the final radar image I. The invention effectively suppresses multi-path phantom interference, improves the signal-to-noise ratio of images and the detection performance of concealed targets behind walls.

Description

Technical field [0001] The invention belongs to a through-wall radar imaging technology and relates to a multipath phantom suppression technology. Background technique [0002] The through-wall radar imaging technology mainly uses antenna elements to emit specific electromagnetic waves to penetrate the walls of buildings to achieve building layout imaging and detection, imaging and positioning of hidden targets behind walls. In recent years, it has been widely used in anti-terrorism, law enforcement, disaster rescue and other fields. Application and significant social research value. However, in a closed building detection environment, electromagnetic waves produce multiple reflections on the inner surface of the building wall, introducing serious multipath clutter interference, resulting in a large number of multipath phantoms in the imaging results, and affecting the detection and imaging performance of real targets. Therefore, the location and suppression of multipath phantom...

AI Technical Summary

Problems solved by technology

The first method assumes that the electromagnetic wave is specularly reflected on the wall surface, calculates the area where the multipath phantom appears in the imaging result, and then uses the 2-D Gaussian weight function to move and superimpose the pixel points of the multipath phantom area to the corresponding target position area , so as to achieve the suppression of multipath phantom interference, but this method will cause the loss of real targets in the multipath phantom area, and false alarms will occur; the second is a multipath phantom suppression method based on compressed sensing theory, using the echo after downsampling Signal data, the original scene is sparsely reconstructed to obtain the measurement matrix, and then the radar imaging scene is restored by solving the mixed-norm optimization problem. However, this method involves a huge matrix operation, which greatly increases the computational complexity and is difficult Meet the requirements of real-time detection and imaging

[0004] The multipath phantom in through-wall radar imaging seriously affects the detection and imaging of concealed targets in buildings, resulting in the deterioration of the final radar image quality. Therefore, the study of multipath phantom suppression in through-wall radar has important theoretical and practical value

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