Comparison between SAR Atmospheric Phase Screens at 30´ by Means of ERS and Envisat Data

The permanent scatterers (PS) technique is able to estimate atmospheric artifacts that delay the SAR interferometric phase over pointwise targets. In this work, for the first time, the atmospheric phase screen (APS) estimated with ERS data is compared to the APS retrieved with ENVISAT data at 30´ time delay. The goal of the comparison is to add new insights to the phase delay that affects InSAR measurements. Preliminary but interesting real data results have been obtained over the city of Milan.