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摘要

全文摘要次数: 151 全文下载次数: 123
引用本文:

DOI:

10.11834/jrs.20210423

收稿日期:

2020-09-24

修改日期:

2021-02-23

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双极化Sentinel-1数据极化时序InSAR技术地表形变监测——以上海市浦东机场为例
摘要:

合成孔径雷达(Synthetic Aperture Radar,SAR)不同极化通道数据对地物具有不同响应,利用多极化信息可提升单极化SAR数据地表形变监测能力。针对免费双极化Sentinel-1数据,已有研究对比了不同极化(VV-VH)地表形变监测能力,或基于单一相位质量评价准则对某种散射目标进行极化优化,未能充分挖掘双极化Sentinel-1数据地表形变监测潜力。为此,本文提出一种基于双极化Sentinel-1数据的自适应极化时序InSAR技术方法(Polarimetric Persistent Scatterer Interferometry,PolPSI)。以上海市浦东国际机场为研究区,基于34景双极化(VV-VH)Sentinel-1影像,利用提出PolPSI技术对研究区稳定散射目标(PS,Persistent Scatterer)与分布式散射目标(DS,Distributed Scatterer)分别进行自适应极化优化,随后基于极化优化干涉图进行地表形变监测。结果表明,采用本文PolPSI算法能有效提升干涉图相位质量,增加高质量监测像元密度,相较于常规时序PS与DS技术,提出PolPSI技术获取的监测像元密度分别提高了103%和30.8%,可较好反演机场区域形变。本文提出的基于双极化Sentinel-1数据PolPSI方法通过对极化信息的利用与挖掘,可一定程度上提高Sentinel-1数据在地表形变监测应用中的能力。

Dual-polarization Sentinel-1 Data Polarization Time Series InSAR Technology Surface Deformation Monitoring——Taking Shanghai Pudong Airport as an Example
Abstract:

Synthetic Aperture Radar (SAR) data from different polarization channels have different responses to ground objects. Using multi-polarization SAR data can improve the surface deformation monitoring capabilities of conventional single-polarization InSAR technology. For the dual-polarization Sentinel-1 data, existing studies have compared the deformation monitoring capabilities of different polarization data (VV-VH), or optimized a certain scattering target based on single quality criterion to improve its interference phase quality. Failed to fully tap the potential of dual-polarized Sentinel-1 data. To this end, this paper proposes an adaptive polarization timing InSAR method (PolPSI) based on dual-polarization Sentinel-1 data. Taking Shanghai Pudong International Airport as an example, using 34 scenes of dual-polarization (VV-VH) Sentinel-1 images, adaptivly optimize the persistent scatterer target and distributed scattering target in the study area to obtain an optimized interferogram, and use this as a basis to monitor surface deformation. The results show that the use of the PolPSI algorithm can effectively improve the phase quality of scatterers and increase the density of high-quality monitoring pixels. Compared with the conventional PSI and DSI technologies, the density of monitored pixels obtained by the PolPSI technology in this paper has increased by 103% and 30.8%, respectively, which can better invert the deformation of the airport area. Through the utilization and mining of polarization information, the PolPSI method based on dual-polarization Sentinel-1 data proposed in this paper can improve the ability of Sentinel-1 data in the application of surface deformation monitoring.

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