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The first basic step in the permanent scatterers analysis technique is the location of the stable reflectors. For 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). The effects of the interpolation of the SLC (Single Look Complex) 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.