IMPROVEMENT OF THE TROPOSPHERIC CORRECTION BY ADAPTED PHASE FILTERING

Colonia (Germany), 4-6 June

Tropospheric inhomogeneities can form a major
error source in DinSAR (Differential SAR
Interferometry) measurements used in slow deformation monitoring. Previous studies introduced techniques to correct these artefacts. In [1] they propose to evaluate
and correct tropospheric effects directly from raw differential interferograms by estimating the phase/altitude correlation. Since the wrapped phase noise in these interferograms influences the correction
of tropospheric artefacts its removal is mandatory. In this paper, we aim to show that adapted wrapped phase filtering greatly improves the retrieval of tropospheric
effects. The filtered interferograms are then used to model these artefacts. Filtered and unfiltered results are compared to quantify the improvement.