SAR ground moving targets relocation via co-prime arrays

• Published in: 2017 IEEE Radar Conference (RadarConf) pp. 0792 - 0796
• Main Authors: Zuzhen Huang, Jia Xu, Li Liu, Teng Long, Zhirui Wang
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.05.2017
• Subjects: Array signal processing; Azimuth; azimuth location ambiguity; co-prime arrays; Covariance matrices; Doppler effect; Estimation; ground moving target indication (GMTI); Multiple signal classification; Synthetic aperture radar; synthetic aperture radar (SAR)
• ISSN: 2375-5318
• DOI: 10.1109/RADAR.2017.7944311

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 multi-channels 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.