A Sub-aperture Detection Algorithm for Single Channel SAR-GMTI

Detection of moving targets in singlechannel SAR images is discussed. By introducing thetwo and three channel SAR-GMTI techniques in common use, a new detection algorithm based on 3 subaperture Cancellation-after-interferometry (CAI) is proposed, in which multi-aperture images are pre-formed byoverlapped frequency division of clutter bandwidth andthen compensated of magnitude and phase errors betweenthem. Simulation results show the proposed algorithmhaving better robustness against clutter uncertainty especially in strong clutter environments. Performance analysis of multi-channel detection method also show that theproposed single-channel algorithm has no direct capabilityof parameter estimation brought by substantial problemof correlation lost caused by shortage of multi-channel deployment.