A novel multi-channel SAR-GMTI algorithm based on raw data

This paper presents a novel SAR-GMTI algorithm based on the range-compressed raw data. FrFT is introduced to the classical three-channel DPCA system to realize the moving target detection, parameter estimation and SAR imaging, acquiring an exact GMTI image of accelerative moving targets. As a pretreatment, Keystone transform is firstly applied to process the echoes receiving from each sub-aperture respectively in order to remove the range migration. Our scheme is available even under a clutter-rich and low SNR environment. The simulation results indicate the efficiency of the method.