A sub-aperture detection algorithm for single channel SAR-GMTI

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