Approaches of Single Channel SAR Combining ATI for GMTI

This paper investigates a detector based on polynomial curve fit for slow ground moving target indication (GMTI) with a single channel synthetic aperture radar (SAR) multi-look along track interferometry (ATI). In addition to the steps of constructing multi-look using overlapped or unoverlapped windows, imaging, phase compensation and performing interferometric processing involved in common techniques of ATI used for single channel clutter suppression , the approach in this paper farther divides real parts of single channel ATI signals into numerous regions, calculates histograms of imagery parts of signals and adjudges threshold for special region by predetermined probability of false alarm (Pfa), and finally the detector is obtained by higher order polynomial curve fit throughout the data area. Another new method of moving target validation via multi-look sample covariance matrix is also proposed. Simulation results show the effectiveness of these methods in the detection of moving targets submerged in strong clutter