Interferometric Phase Retrieval for Multimode InSAR via Sparse Recovery

Huizhang Yang; Chengzhi Chen; Shengyao ChenFeng XiZhong Liu

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Interferometric Phase Retrieval for Multimode InSAR via Sparse Recovery

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摘要

Modern spaceborne synthetic aperture radar (SAR) features a capacity of multiple imaging modes. It comes with Earth-observation data archives consisting of SAR images acquired in various modes with different resolutions and coverage. In this context, in addition to using single-mode images for SAR interferometry (InSAR), exploiting images acquired in different imaging modes for InSAR can provide extra interferograms and, thus, favors the retrieval of interferometric information. The interferometric processing of multimode image pairs requires special considerations due to significant variations in the Doppler spectra. Conventionally, the InSAR technique only uses the spectral band common in both master and slave images, and the remaining band is discarded before interferogram formation. Therefore, conventional processing cannot make full use of the observed data, and the interferogram quality is limited by the common band spectra. In this article, by exploiting the conventionally discarded spectrum, we present a new interferometric phase retrieval method for multimode InSAR data to improve interferogram quality. To this end, first, we propose a linear model to characterize the interferometric phase of a multimode image pair based on image spectral relation. Second, we adopt a sparse recovery method to inverse the linear model for the retrieval of the interferometric phase. Finally, we present real-data experiments on TerraSAR-X staring spotlight to sliding spotlight interferometry and Sentinel-1 strip map to Terrain Observation by Progressive Scan (TOPS) interferometry to test the proposed method. The experiment results show that the proposed method can provide interferograms with reduced phase noise and defocusing effect for multimode InSAR.

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《IEEE Transactions on Geoscience and Remote Sensing》 |2021年第1期|333-347|共15页
作者
Huizhang Yang; Chengzhi Chen; Shengyao ChenFeng XiZhong Liu;
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作者单位

School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, China;

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正文语种英语
中图分类地球物理学;遥感技术;
关键词
Azimuth; Synthetic aperture radar; Doppler effect; Image resolution; Interferometry; Imaging; Radar imaging; Compressive sensing (CS); ?? regularization; multiple modes; SAR interferometry (InSAR); sparse recovery; spectral extrapolation; spotlight; strip map (SM); Terrain Observation by Progressive Scan (TOPS);

Interferometric Phase Retrieval for Multimode InSAR via Sparse Recovery

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