Spread spectrum through-the-wall radar imaging method based on compression perception technology

Abstract

The present invention discloses a spread spectrum through-the-wall radar imaging method based on the compression perception technology. After an index average background elimination method is employed to remove the direct wave and the wall clutter, measurement signals are obtained through a random measurement matrix, a dictionary having been set and the measurement matrix are combined to construct a compressed perception model of a multi-measurement vector (MMV), target image information after the all is reconstructed from the measurement including few measurement values through an orthogonal matching pursuit (OMP) method, and finally, the through-the-wall radar is completed according to the target after the wall. Compared with a traditional synthetic aperture radar imaging method, the spread spectrum through-the-wall radar imaging method based on the compression perception technology is able to greatly reduce the number of the observation points and the data storage amount and shorten the recording time. The problems are solved that the spread spectrum through-the-wall radar SAR imaging method in the prior art requires lots of observation antennas, large data storage space and long data recording time.

Description

technical field [0001] The invention belongs to the technical field of through-wall radar life detection, and in particular relates to a spread-spectrum through-wall radar imaging method based on compressed sensing technology. Background technique [0002] In recent years, radar-based through-wall life detection technology has been widely used in many military and civilian fields such as building structure determination, post-disaster rescue (fire, snow disaster, earthquake, etc.), anti-terrorism, and street fighting. In the field of radar-based life detection imaging through walls, the back projection (Back Projection, BP) algorithm is often used for synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging of targets behind walls. To determine the location of objects behind walls as accurately as possible, BP imaging methods require broadband, large-aperture radar systems to achieve very high range resolution. However, large-aperture through-wall radar imaging syst...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a spread-spectrum through-wall radar imaging method based on compressed sensing technology, which solves the problem of the large number of observation antennas and large data storage space required by the spread-spectrum through-wall radar SAR imaging method in the prior art , The problem of long data recording time

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