Research Papers

Coherence estimation method and its application to phase unwrapping

[+] Author Affiliations
Sihua Fu, Xuejun Long, Xia Yang

National University of Defense Technology, College of Opto-Electronic Science & Engineering, Opto-Electronic Technology Laboratory, Changsha, Hunan 410073 China

J. Appl. Remote Sens. 4(1), 043505 (February 3, 2010). doi:10.1117/1.3328871
History: Received August 1, 2009; Revised December 28, 2009; Accepted January 18, 2010; February 3, 2010; Online February 03, 2010
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Abstract

Coherence of interferometric synthetic aperture radar (InSAR) complex image pair is a fundamental observable in interferometric radar measurements, which is usually measured by comparing the radar return across several nearby radar image pixels and has found diverse applications. This paper proposes a coherence estimation method which requires three arbitrary parts of the two complex images to implement interference. The proposed method can also be used to co-register InSAR image pair, which means that the imaginary part of the master image can be left away. In addition, an improved quality-guided phase unwrapping method is forwarded with the quality map generated by the coherence estimation method we have recommended above. A look-up table is adopted to reduce the processing time. The experimental results show that both methods are effective and greatly reduce the phase unwrapping time compared with the existing quality-guided methods.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Sihua Fu ; Xuejun Long and Xia Yang
"Coherence estimation method and its application to phase unwrapping", J. Appl. Remote Sens. 4(1), 043505 (February 3, 2010). ; http://dx.doi.org/10.1117/1.3328871


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