A detector for slow GMTI (ground moving target indication) with a single channel SAR (synthetic aperture radar) multi-look ATI (along track interferometry) was investigated. The steps include constructing multi-look using overlapped or unoverlapped windows, respective imaging, phase compensation and performing interferemetric processing. Concerning the crucial step of phase error rectification, a compensation method of phase calibration using SSP (signal subspace processing) was proposed. By this robust and adaptive approach,decorrelation between sub-images can be resolved and phase randomicity of multi-look ATI can be alleviated to some extent, moving targets can be isolated much easily from interferometric phase of multi-look sub-images. Simulation results show effectiveness of the method in moving targets detection in strong clutter, thus it provides reliable reference for single channel SAR GMTI and supports operational extension of existing SAR system.
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