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2013-12-16
A Method of Filtering and Unwrapping SAR Interferometric Phase Based on Nonlinear Phase Model
By
Progress In Electromagnetics Research, Vol. 144, 67-78, 2014
Abstract
This paper presents a new efficient algorithm of filtering and unwrapping phase images for interferometric synthetic aperture radar (InSAR) based on nonlinear phase model. First, we analyzed the statistical and signal properties of interferometric phase, and proposed the concept of nonlinear phase model. The model of reflecting topographic contour is used to approximate the interferometric phase variation occured over the local window. And the lower amplitude bound of the principal vector is decided and the value solution method is given, which can solve effectively and adaptively the nonlinear factor of the phase. Second, we studied the application of nonlinear phase model in interferometric phase filtering. When compared with other advanced filters, the nonlinear phase compensation filter, with a higher computation efficiency and a better phase estimation accuracy in low coherence areas, has a stronger ability to reduce interferometric phase noise in rugged terrain Finally, we introduced the nonlinear phase model to phase unwrapping, which increased the reliability of integration path and the accuracy of the phase gradient, and improved effectively the performance of phase unwrapping. And the real data processing results demonstrated the validity of the proposed nonlinear phase model and of the corresponding solutions.
Citation
Haifeng Huang, and Qingsong Wang, "A Method of Filtering and Unwrapping SAR Interferometric Phase Based on Nonlinear Phase Model," Progress In Electromagnetics Research, Vol. 144, 67-78, 2014.
doi:10.2528/PIER13080806
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