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Subsidences estimation from ground based SAR: techniques and experimental results

Andrea Monti Guarnieri(1), Fabio Rocca(1), DAvide D'Aria(2), Giulia Bernardini(3) and P Ricci(3)

(1) Politecnico, Piazza Leonardo da vinci, 32, 20133, Italy
(2) ARESYS, Piazza Leonardo da vinci, 32, 20133, Italy
(3) IDS, Via Sterpulino, 20, 56100 PISA, Italy

Abstract

The IBIS-L is a ku-band ground based SAR with 2 m synthetic aperture suited for monitoring subsidences and landslides by repeat-pass differential SAR interferometry. The intrinsic accuracy of the system, as measured in labs, is in the order of micrometer, however performances drops in open air, due to atmospheric turbulence and targets decorrelation. The short term variations of the travel path due to water vapour have beeen measured with time steps of 5 minutes and with an horizontal resolution of about 4 m x 50 cm. The results show that the travel path changes are much stronger during the day then during the night. The goal of the measurement campaign is to find optimal algorithms to interpolate the effects of the Atmospheric Phase Screen from the results on Persistent Scatterers located close to the target. Thus, its impact on satellite measurements could be reduced. In the paper we will provide a description of the acquisition system, and the PS based processing, together with results achieved on both urban and rural campaigns.

 

Workshop presentation

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry