Phase Offset Estimation for DEM Reconstruction in Multi-Channel SAR Interferometry

Multi-channel Interferometric SAR (InSAR) systems allow the estimation of the height profile of the Earth surface, exploiting the availability of multiple radar acquisitions, obtained via different baselines/frequencies. Maximum A Posteriori (MAP) statistical technique, and Markov random field image models, have shown to be effective for such estimation problem. However, real interferograms are affected from the presence of undetermined phase offsets, which makes impossible to get correct height estimation. In this paper we present a procedure to estimate phase offsets. The procedure is tested on simulated data, showing the effectiveness of the method.