Impact of Perpendicular and Temporal Baseline in Accuracy ofAtmospherically Corrected InSAR Displacement Velocity Fields

Synthetic aperture radar interferometry is an efficient technique to obtain displacementvelocity fields. In this technique, there are some limitation including of, temporal andgeometrical decorrelation, therefore phase noise occurs on results. This phase noise can be measured by the amount of decorrelation defined between two SAR images as coherence. In this paper, the effect of coherence and also effect of perpendicular and temporal baseline on displacement velocity fields was examined. We show that these features can be used for the purposes of geodesy. We have measured interseismic deformation of the area in the north west of Iran using 2 tracks of ASAR/ENVISAT acquisitions between 2003 and 2010 that corrected from global meteorological reanalysis models. We uses 5 GPS stations to compare the results of two tracks. The RMSE of the derived displacment velocity vectors for track 49 is 0.73 mmyr-1 and for track 278 is 2.91 mmyr-1. Track 49 for reasons such as higher coherence and lower perpendicular baselines and homogeneous temporal baselines gives more accurate results. In other words, using the features of the perpendicular and temporal baselines, we can choose the appropriate track to find a more accurate displacement velocity fields in geodesy.

کلیدواژه ها:

Coherence ، InSAR ، Displacement Field ، Perpendicular and Temporal Baseline