A New Method Of Resolving Velocity Ambiguities In Multi-Channel Interferometric Sar/Gmti

Along-track interferometry is an effective technique of the land clutter suppression for Ground Moving Target Indication (GMTI). Based on the principle of clutter cancellation in dual channels along-track interferometric Synthetic Aperture Radar (SAR), the performance of relocation and radial velocity estimation in the three channels SAR/GMTI is analyzed, and a set of analytical formulas is derived. To solve velocity ambiguities resulted from interferometeric phase, unequal separation four channels along-track interferometric SAR/GMTI scheme is proposed, and the method of resolving velocity ambiguities is presented in detail. In addition, irregular spacing of sub-aperture help to exclude blind velocities and improve detection probability. Theoretical analysis and simulation results show the validity of this scheme.