ASAR Multiple Moving Targets Imaging Based on ADMM
In order to achieve simultaneously excellent multiple moving target imaging quality and imaging efficiency,a SAR multiple moving target imaging method based on alternating direction method of multi-pliers(ADMM)is proposed by utilizing the multi-component linear frequency modulation signal form and sparse prior knowledge of synthetic aperture radar(SAR)multiple moving target signals,First,a sparse observation model of SAR multiple moving targets is established to formulate the multiple moving target imaging task into an inverse problem with the sparse feature constraint.Then the adaptive Chirplet decom-position method is applied to realize the estimation of target Doppler modulation frequencies for the obser-vation matrix construction.The well-focused SAR image of multiple moving targets can be sparsely recon-structed based on ADMM decomposing the complex convex optimization problem into several simple sub-problems which can be alternately solved.Finally,the simulations and the experiments on airborne SAR data show that the proposed method is superior to the existing moving target imaging methods in terms of imaging quality and imaging efficiency.
synthetic aperture radarmultiple moving target imagingalternating direction method of mul-tiplierssparse reconstruction
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