Moving target detection imaging method of dual-channel frequency modulation continuous wave SAR system

Abstract

A moving target detection imaging method of a dual-channel frequency modulation continuous wave SAR system comprises the steps of recording echo data by a radar system, performing residual video phase removing processing on the echo data, performing Doppler frequency shift compensation on the data, performing phase deviation compensation on two-channel conversion data, and performing subtraction processing on the two-channel data; performing migration correction and direction dechirping processing on an image with clutter cancellation to realize the rough imaging of a target, and detecting the moving target and extracting one by one; performing inverse transformation on the extracted targets to an original data domain, estimating motion parameters to construct a precise direction dechirping function of the moving target, performing residual video phase removing processing, precise direction dechirping processing and distance migration correction, constructing a fuzzy function for compensation, and then performing Keystone transformation to finish the precise image of the moving target. The moving target detection imaging method solves the imaging problem of the fast moving target when motion parameters are unknown under the continuous wave system, so the signal-to-noise rate and the target detection probability are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a moving target detection and imaging method of a dual-channel FM continuous wave SAR system in the field of radar signal processing. Background technique [0002] Moving target detection is an important application of Synthetic Aperture Radar (SAR) in the field of reconnaissance. Existing SAR systems mostly use the pulse system, and the radar system has complex structure, large volume and weight, and high cost, which limits its working platform. The frequency modulated continuous wave (FMCW) SAR system obtained by combining synthetic aperture technology with frequency modulated continuous wave radar has the advantages of small size, light weight, low power consumption, low cost, and good concealment. It can be installed in Small platforms such as unmanned aerial vehicles have quite broad application prospects, and are gradually becoming a research hotspot ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a moving target detection and imaging method for a dual-channel FM continuous wave SAR system to solve the problems of spectrum splitting and severe defocus in the prior art when imaging fast targets, and to achieve high-quality imaging of fast moving targets

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