Offset Phase Estimation in Multi-Channel InSAR DEM Reconstruction

Interferometric SAR (InSAR) systems are able to estimate height profiles of the Earth surface. For the involved estimation problem, Maximum A Posteriori (MAP) statistical technique and Markov Random Field image models have been used, showing to be effective in case of multiple interferograms, obtained via different baselines/frequencies. In this paper, we face the problem of unknown phase offsets presence affecting real interferograms, which makes impossible to retrieve correct height estimations. We present a procedure to estimate these offset values, based on statistical estimation and we test it both on simulated and real data, showing the effectiveness of the method.