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Proceedings Paper

Weighted least-squares algorithm for phase unwrapping based on confidence level in frequency domain
Author(s): Shaohua Wang; Jie Yu; Cankun Yang; Shuai Jiao; Jun Fan; Yanyan Wan
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Paper Abstract

Phase unwrapping is a key step in InSAR (Synthetic Aperture Radar Interferometry) processing, and its result may directly affect the accuracy of DEM (Digital Elevation Model) and ground deformation. However, the decoherence phenomenon such as shadows and layover, in the area of severe land subsidence where the terrain is steep and the slope changes greatly, will cause error transmission in the differential wrapped phase information, leading to inaccurate unwrapping phase. In order to eliminate the effect of the noise and reduce the effect of less sampling which caused by topographical factors, a weighted least-squares method based on confidence level in frequency domain is used in this study. This method considered to express the terrain slope in the interferogram as the partial phase frequency in range and azimuth direction, then integrated them into the confidence level. The parameter was used as the constraints of the nonlinear least squares phase unwrapping algorithm, to smooth the un-requirements unwrapped phase gradient and improve the accuracy of phase unwrapping. Finally, comparing with interferometric data of the Beijing subsidence area obtained from TerraSAR verifies that the algorithm has higher accuracy and stability than the normal weighted least-square phase unwrapping algorithms, and could consider to terrain factors.

Paper Details

Date Published: 17 December 2015
PDF: 6 pages
Proc. SPIE 9811, MIPPR 2015: Multispectral Image Acquisition, Processing, and Analysis, 98110Q (17 December 2015); doi: 10.1117/12.2205700
Show Author Affiliations
Shaohua Wang, Capital Normal Univ. (China)
Jie Yu, Capital Normal Univ. (China)
Cankun Yang, Capital Normal Univ. (China)
Shuai Jiao, Capital Normal Univ. (China)
Jun Fan, Capital Normal Univ. (China)
Yanyan Wan, Capital Normal Univ. (China)

Published in SPIE Proceedings Vol. 9811:
MIPPR 2015: Multispectral Image Acquisition, Processing, and Analysis
Jinxue Wang; Zhiguo Cao; Jayaram K. Udupa; Henri Maître, Editor(s)

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