An enhanced spectral diversity coregistration method for dualpolarimetric Sentinel-1A/B TOPS data  

作　　者：Nan Fang Xingjun Luo Peng Shen Lei Xie Guoming Liu Feixiang Wei Kun Jiang Wenbin Xu 

机构地区：[1]Lab of Volcano and Earthquake Research,School of Geosciences and Info-Physics,Central South University,Changsha 410083,China [2]Jilin Changbaishan Volcano National Observation and Research Station,Institute of Geology,China Earthquake Administration,Beijing 100029,China [3]Institute of Geology,China Earthquake Administration,Beijing 100029,China

出　　处：《Geodesy and Geodynamics》2023年第5期431-437,共7页大地测量与地球动力学（英文版）

基　　金：supported by Jilin Changbaishan Volcano National Observation and Research Station(Project No.NORSCBS20-04);National Natural Science Foundation of China(42174023);the Fundamental Research Fund for the Central Universities of Central South University(No.506021722).

摘　　要：Sentinel-1A/B data are crucial for retrieving numerical information about surface phenomena and processes.Coregistration of terrain observation by progressive scans(TOPS)data is a critical step in its application.TOPS data must be fundamentally co-registered with an accuracy of 0.001 pixels.However,various decorrelation factors due to natural vegetation and seasonal effects affect the coregistration accuracy of TOPS data.This paper proposed an enhanced spectral diversity coregistration method for dual-polarimetric(PolESD)Sentinel-1A/B TOPS data.The PolESD method suppresses speckle noise based on a unified non-local framework in dual-pol Synthetic Aperture Radar(SAR),and extracts the phase of the optimal polarization channel from the denoised polarimetric interferometric coherency matrix.Compared with the traditional ESD method developed for single-polarization data,the PolESD method can obtain more accurate coherence and phase and get more pixels for azimuth-offset estimation.In bare areas covered with low vegetation,the number of pixels selected by PolESD is more than the Boxcar method.It can also correct misregistration more effectively and eliminate phase jumps in the burst edge.Therefore,PolESD will help improve the application of TOPS data in low-coherence scenarios.

关 键 词：COREGISTRATION Terrain observation by progressive scans (TOPS) Enhanced spectral diversity DUAL-POLARIZATION 

分 类 号：P237[天文地球—摄影测量与遥感]