A Phase Unwrapping Approach Based on the Branch-Cut Method and Finite Element Method for Interferometric SAR
一种基于枝切法和有限元法的干涉SAR合成相位展开方法

A two-dimensional phase unwrapping approach is proposed using the branch-cut method and finite element method. Different strategies are taken for different quality data regions: first, using the “congruence” characteristic of the branch-cut method, the unwrapped phases can be retrieved in the reliable region with the largest area; then with good boundary values provided, the remaining regions are unwrapped with the finite element method (FEM) in a least square sense. Experimental results, carried out on simulated and real data, show that the proposed approach overcomes the drawbacks of the branch-cut method and FEM, i.e., the “half-baked” solution and phase slope underestimation, respectively, and has an advantage over other approaches in accuracy.