A Modified EVD-Based Phase Linking Method in Decorrelated Scenario With Time Series Polarimetric Scattering Consistency
Decorrelated scenarios, such as vegetated areas, are influenced by multiple scattering mechanisms and temporal decorrelation, which introduce phase noise and coherence estimation bias, posing challenges for phase linking (PL). The eigenvalue decomposition (EVD) method, well-suited for multiscatterin...
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2025-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
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| Online Access: | https://ieeexplore.ieee.org/document/10909407/ |
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| author | Guanya Wang Zhiwei Li Jun Hu Peng Ren Yan Zhu |
| author_facet | Guanya Wang Zhiwei Li Jun Hu Peng Ren Yan Zhu |
| author_sort | Guanya Wang |
| collection | DOAJ |
| description | Decorrelated scenarios, such as vegetated areas, are influenced by multiple scattering mechanisms and temporal decorrelation, which introduce phase noise and coherence estimation bias, posing challenges for phase linking (PL). The eigenvalue decomposition (EVD) method, well-suited for multiscattering environments, mitigates these issues by decomposing signals into orthogonal eigenvectors, thus reducing the impact of multiscattering mix on PL. However, EVD's effectiveness relies on the assumption of polarimetric stationarity, which is often violated in low-coherence scenarios due to the dynamic nature of vegetation and meteorological factors. Multipolarization SAR data can address this challenge by enabling quantitative assessment of polarimetric stationarity via likelihood statistics of time series polarimetric covariance matrices. To enhance EVD, we introduce the time series polarimetric scattering consistency contribution (TSCC) metric, which evaluates the contribution of each interferometric pair to overall scattering consistency. The TSCC metric, based on the ratio of local to global scattering consistency, identifies interferometric data that meet the polarimetric stationarity assumption. Based on the scattering amplitude variations, it offers an available data quality assessment in decorrelated regions. Replacing traditional coherence weights, the TSCC metric modifies EVD to prioritize temporally stable interferometric pairs, improving phase consistency with actual deformation signals. Experimental results show that the proposed method outperforms traditional methods, achieving a 15% improvement in point density for distributed scatterers in evergreen forest areas and an 82% improvement in point number of positive posterior coherence difference compared to classical EVD. |
| format | Article |
| id | doaj-art-aacf0a22865e4370b5be74364cb2a708 |
| institution | Kabale University |
| issn | 1939-1404 2151-1535 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
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| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj-art-aacf0a22865e4370b5be74364cb2a7082025-08-20T03:42:02ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing1939-14042151-15352025-01-01187694770610.1109/JSTARS.2025.354794710909407A Modified EVD-Based Phase Linking Method in Decorrelated Scenario With Time Series Polarimetric Scattering ConsistencyGuanya Wang0https://orcid.org/0000-0003-2837-8905Zhiwei Li1https://orcid.org/0000-0003-4575-5258Jun Hu2https://orcid.org/0000-0002-5412-2703Peng Ren3https://orcid.org/0000-0003-3949-985XYan Zhu4https://orcid.org/0009-0008-3524-2137School of Oceanography and Space Informatics, China University of Petroleum at East China, Qingdao, ChinaSchool of Geosciences and Info-Physics, Central South University, Changsha, ChinaSchool of Geosciences and Info-Physics, Central South University, Changsha, ChinaSchool of Oceanography and Space Informatics, China University of Petroleum at East China, Qingdao, ChinaSchool of Geosciences and Info-Physics, Central South University, Changsha, ChinaDecorrelated scenarios, such as vegetated areas, are influenced by multiple scattering mechanisms and temporal decorrelation, which introduce phase noise and coherence estimation bias, posing challenges for phase linking (PL). The eigenvalue decomposition (EVD) method, well-suited for multiscattering environments, mitigates these issues by decomposing signals into orthogonal eigenvectors, thus reducing the impact of multiscattering mix on PL. However, EVD's effectiveness relies on the assumption of polarimetric stationarity, which is often violated in low-coherence scenarios due to the dynamic nature of vegetation and meteorological factors. Multipolarization SAR data can address this challenge by enabling quantitative assessment of polarimetric stationarity via likelihood statistics of time series polarimetric covariance matrices. To enhance EVD, we introduce the time series polarimetric scattering consistency contribution (TSCC) metric, which evaluates the contribution of each interferometric pair to overall scattering consistency. The TSCC metric, based on the ratio of local to global scattering consistency, identifies interferometric data that meet the polarimetric stationarity assumption. Based on the scattering amplitude variations, it offers an available data quality assessment in decorrelated regions. Replacing traditional coherence weights, the TSCC metric modifies EVD to prioritize temporally stable interferometric pairs, improving phase consistency with actual deformation signals. Experimental results show that the proposed method outperforms traditional methods, achieving a 15% improvement in point density for distributed scatterers in evergreen forest areas and an 82% improvement in point number of positive posterior coherence difference compared to classical EVD.https://ieeexplore.ieee.org/document/10909407/Distributed scatterer (DS)eigenvalue decomposition (EVD)multitemporal interferometric synthetic aperture radar (MT-InSAR)phase linking (PL)polarimetric scattering consistency |
| spellingShingle | Guanya Wang Zhiwei Li Jun Hu Peng Ren Yan Zhu A Modified EVD-Based Phase Linking Method in Decorrelated Scenario With Time Series Polarimetric Scattering Consistency IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Distributed scatterer (DS) eigenvalue decomposition (EVD) multitemporal interferometric synthetic aperture radar (MT-InSAR) phase linking (PL) polarimetric scattering consistency |
| title | A Modified EVD-Based Phase Linking Method in Decorrelated Scenario With Time Series Polarimetric Scattering Consistency |
| title_full | A Modified EVD-Based Phase Linking Method in Decorrelated Scenario With Time Series Polarimetric Scattering Consistency |
| title_fullStr | A Modified EVD-Based Phase Linking Method in Decorrelated Scenario With Time Series Polarimetric Scattering Consistency |
| title_full_unstemmed | A Modified EVD-Based Phase Linking Method in Decorrelated Scenario With Time Series Polarimetric Scattering Consistency |
| title_short | A Modified EVD-Based Phase Linking Method in Decorrelated Scenario With Time Series Polarimetric Scattering Consistency |
| title_sort | modified evd based phase linking method in decorrelated scenario with time series polarimetric scattering consistency |
| topic | Distributed scatterer (DS) eigenvalue decomposition (EVD) multitemporal interferometric synthetic aperture radar (MT-InSAR) phase linking (PL) polarimetric scattering consistency |
| url | https://ieeexplore.ieee.org/document/10909407/ |
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