Moving target location and imaging using dual-speed velocity SAR

To improve the ability of suppressing clutter as well as locating the moving targets without any ambiguity, dual-speed velocity SAR (DS-VSAR) is proposed in this paper. In DS-VSAR system, the platform flies with two different specified speeds in the imaging time duration. Multiple complex images are formed by multiple receiving antennas and transmitted into velocity-images (V-images), where moving targets may be separated from strong stationary clutter in terms of their motion parameters. Furthermore, the locations of the moving targets may be estimated accurately by using the information in two V-images under two platform speeds and the Chinese remainder theorem (CRT). Therefore DS-VSAR has the ability of not only to suppress clutter but also to locate and image both slowly and fast moving targets accurately. Some numerical experiments are given to show the effectiveness of DS-VSAR