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Sensors 2008, 8(11), 7172-7190; doi:10.3390/s8117172

Interferometric Phase Improvement Based on Polarimetric Data Fusion

Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China
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Author to whom correspondence should be addressed.
Received: 2 June 2008 / Revised: 7 September 2008 / Accepted: 7 November 2008 / Published: 13 November 2008
(This article belongs to the Special Issue Synthetic Aperture Radar (SAR))
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Abstract

In this paper, a method is proposed to improve the interferometric phase quality, based on fusing data from different polarimetric channels. Since lower amplitude implies less reliable phase in general, the phase quality of polarimetric interferometric data can be improved by seeking optimal fusion of data from different polarizations to maximize the resulting amplitude. In the proposed approach, for each pixel, two coherent polarimetric scattering vectors are synchronously projected onto a same optimum direction, maximizing the lower amplitude of the two projections. In the single-look case, the fused phase is equivalent to the weighted average of phases in all polarimetric channels. It provides a good physical explanation of the proposed approach. Without any filtering, the phase noise and the number of residue points are significantly reduced, and the interferometric phase quality is greatly improved. It is a useful tool to preprocess the phase ahead of phase unwrapping. The Cloude’s coherence optimization method is used for a comparison. Using the data collected by SIR-C/X-SAR, the authors demonstrate the effectiveness and the robustness of the proposed approach. View Full-Text
Keywords: Polarimetric SAR interferometry; phase improvement Polarimetric SAR interferometry; phase improvement
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Xiong, T.; Yang, J.; Zhang, W. Interferometric Phase Improvement Based on Polarimetric Data Fusion. Sensors 2008, 8, 7172-7190.

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