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| A Phase Unwrapping Approach Based on the Branch-Cut Method and Finite Element Method for Interferometric SAR |
| Wu Nan; Feng Da-zheng; Liu Bao-quan |
| National Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China |
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Abstract 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.
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Received: 05 September 2005
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2007, Vol. 29 
