Optimum interpolation and resampling for PSC identification

The first basic step in the Permanent Scatterers analysis technique is the location of the stable reflectors. To this purpose, an inter-image amplitude analysis, on a pixel-by-pixel basis, is performed, and the scatterers showing stable amplitude response are named Permanent Scatterer Candidates (PSC). In this paper the effects of the interpolation of the SLC images are considered, with particular attention to the oversampling factor and to the interpolation kernels. Finally, experimental results are shown to confirm the PSC theory and the interpolation analysis.