Progress In Electromagnetics Research
ISSN: 1070-4698, E-ISSN: 1559-8985
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By C. Li and D.-Y. Zhu

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Phase unwrapping is a key problem to generate digital elevation maps (DEMs) by synthetic aperture radar (SAR) interferometry. A lot of phase unwrapping algorithms have been proposed to solve this problem. However, in noisy region, many unwrapping algorithms are inoperative because of the denseness of residues. In this paper, we propose a path following phase unwrapping method, namely Residue-Pairing (RP) algorithm. The algorithm starts from residues, based on the aggregate of coordinates of each positive residues (or negative residues), to search the nearest opposite polar residue and connect them. Compared to the Goldstein's algorithm, the brunch cuts produced by this algorithm can effectively decrease their total length and contract the isolated region especially in noisy region. With raw data simulation, the results confirm the validity of RP algorithm in dense-residues region.

C. Li and D.-Y. Zhu, "A residue-pairing algorithm for InSAR phase unwrapping," Progress In Electromagnetics Research, Vol. 95, 341-354, 2009.

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