SAR Ground Moving Targets Relocation via Co-Prime Arrays

A synthetic aperture radar (SAR) moving target is normally shifted from its correct azimuth location in the image due to its radial motion. To address this problem a novel ground moving targets relocation method is proposed in this paper via co-prime arrays. The co-prime arrays can obtain much more virtual elements with a smaller inter-element spacing than the physical elements, which will achieve azimuth location de-ambiguity. Since the Doppler signal of target along multichannels can be approximated as a sinusoid, all the virtual elements can be utilized for Doppler estimation based on the MUSIC algorithm. Compared with the existing Chinese remainder theorem based non-uniform linear array SAR, the proposed method has a better accuracy. Finally, some results of numerical experiments are provided to demonstrate the effectiveness of the proposed method.