期刊
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
卷 19, 期 -, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LGRS.2021.3086271
关键词
Synthetic aperture radar; Strain; Time series analysis; Coherence; Sea measurements; Tools; Signal to noise ratio; Ground deformations; multigrid phase unwrapping (PhU); synthetic aperture radar interferometry (InSAR)
类别
资金
- Italian Ministry of Education, University and Research [D.D. 2261]
- Dragon 5 European Space Agency (ESA) [58351]
A multigrid differential SAR interferometry technique is proposed for detecting ground displacements at different spatial scales. Efficient phase-unwrapping operations are performed at different scales, leading to the retrieval of ground displacement time series.
This work proposes a multigrid differential synthetic aperture radar (SAR) interferometry (InSAR) technique for the detection of ground displacements at different spatial scales. The method relies on efficient phase-unwrapping (PhU) operations performed at the native spatial scales. In particular, a set of multi-look interferograms are first unwrapped using conventional (or advanced) PhU algorithms at the regional scale. Subsequently, ML unwrapped interferograms are used to facilitate the PhU operations performed at the local scale (single-look). Specifically, the unwrapped multi-look interferograms are resampled to the single-look grid and modulo-2 pi subtracted to the single-look interferograms. These phase residuals are then unwrapped and added back to the multi-look resampled interferograms. To accomplish these operations, at variance with alternative multiscale methods, no (linear/nonlinear) models are used to fit the spatial high-pass phase residuals. Finally, the unwrapped single-look interferograms are properly inverted to retrieve the ground displacement time series using any small baseline (SB)-oriented multitemporal InSAR tool. Experimental results are performed by processing a set of SAR data acquired by the X-band COSMO-SkyMed sensor over the coastal area of Shanghai, China.
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