Phase unwrapping for multibaseline SAR interferometry using optimized data

In this paper, a new method of the multibaseline interferometric SAR phase unwrapping based on the model of the optimum data vector is introduced. The method constructs the multibaseline optimal weighted joint data (MOWJD) vector by taking advantage of the coherence information of neighboring pixels in order to adaptively coregister the SAR images and then employ the projection of the joint signal subspace onto the corresponding noise subspace to estimate the unwrapped interferometric phases (or the terrain heights).Theoretical analysis and experimental results show that the method can provide the accurate unwrapped interferometric phase even if the coregistration error is close to one pixel. The effectiveness and robustness of the technique is verified by simulated data.