ScanSAR interferometric monitoring using the PS technique

A technique to provide quite accurate monitoring of small displacements by means of ASAR ScanSAR acquisition is here presented. This technique merges the advantages provided by Permanent Scatterers, namely the high accuracy, and the correlation over wide temporal and spatial baselines, with the advantages provided by WSM, in terms of short revisiting time and global coverage. It is then possible to avoid the marked decorrelation that would arise from the large ENVISAT orbit repeat time-interval and the large ScanSAR resolution cell. The feasibility study here presented has been performing by exploiting a large set of ERS data takes to simulate repeat pass ScanSAR acquisitions. The porting of the PS technique to this case led then to promising results in terms of accuracy and density of PS in the low resolution WS image. Basing on those results, the major limitations and possibilities of the technique have been identified.