Potential of Using Phase Correlation in Distributed Scatterer InSAR Applied to Built Scenarios
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AbstractThe improved spatial resolution of Synthetic Aperture Radar (SAR) images from newly launched sensors has promoted a more frequent use of distributed scatterer (DS) interferometry (DSI) in urban monitoring, pursuing sufficient and detailed measurements. However, the commonly used statistical methods for homogeneous pixel clustering by exploring amplitude information are firstly, computationally intensive; furthermore, their necessity when applied to high-coherent built scenarios is little discussed in the literature. This paper explores the potential of using phase information for the detection of homogeneous pixels on built surfaces. We propose a simple phase-correlated pixel (PCP) clustering and introduce a coherence-weighted phase link (WPL), i.e., PCPWPL, to pursue a faster processing of interferogram phase denoising. Rather than relying on the statistical tests of amplitude characteristics, we exploit vector correlation in the complex domain to identify PCPs with similar phase observations, thus, avoiding the intensive hypothesis test. A coherence-weighted phase linking is applied for DS phase reconstruction. The estimation of geophysical parameters, e.g., deformation, is completed using an integrated network of persistent scatterers (PS) and DS. Efficiency of the proposed method is fairly illustrated by both synthetic and real data experiments. Pros and cons of the proposed PCPWPL were analyzed with the comparison to a conventional amplitude-based strategy using an X-band CosmoSkyMed dataset. It is demonstrated that the use of phase correlation is sufficient for DS monitoring in built scenarios, with equivalent measurement quantity and cheaper computational cost.
All Author(s) ListGuoqiang Shi, Peifeng Ma, Hui Lin, Bo Huang, Bowen Zhang, Yuzhou Liu
Journal nameRemote Sensing
Year2020
Month2
Volume Number12
Issue Number4
PublisherMDPI
Article number686
ISSN2072-4292
LanguagesEnglish-United Kingdom
Keywordsdistributed scatterers, built scenarios, phase correlation, deformation estimation
Web of Science Subject CategoriesRemote Sensing;Remote Sensing

Last updated on 2020-04-12 at 23:30