A tri-look detector for single channel SAR-GMTI

This article studies clutter suppression and detection of moving targets in single channel SAR images. By analysing the most commonly used 3-channel SAR-GMTI principle, a new detector based on tri-look image Cancellation-After-Interferometry (CAI) is proposed where tri-aperture images are constructed by overlapped frequency even-partition of clutter bandwidth. Compared with the single channel SAR detector such as traditional tri-aperture cancellation, simulation results show the proposed algorithm having better robustness against clutter uncertainty especially in strong clutter environments and having capability of detection those with azimuth velocity vector. The simulation and performance comparison with 3-channel detection method also show that the proposed algorithm has no direct capability of parameter estimation resulted from phase randomness in single channel deployment.