Adaptation of squeesar filtering in sar tomography context

Advanced Differential SAR Interferometry and specifically Persistent Scatterers (PS) Interferometry have become popular techniques since they offer the possibility of large-scale analysis and monitoring of Earth's surface. In this work, we address the exploitation of widely used interferometric phase filtering method, SquueSAR, for the PS detection within a two-step processing scheme based on a sequence of low and high-resolution processing. We propose a modification of the iterative approach proposed in [1], in order to avoid phase shifts. The effects of the modification quantify in a significan improvement of the detection performances, verified on both simulated an real data.