基于重构距离向分谱法的时序InSAR电离层校正及分析  

Ionospheric Correction and Analysis for Time-Series InSAR Based on Reformulating Range Split Spectrum Interferometry

作　　者：毛文飞 王晓文 刘国祥[1,2] 杨友涛 向卫[1] 蔡嘉伦 符茵[1] 张瑞 MAO Wenfei;WANG Xiaowen;LIU Guoxiang;YANG Youtao;XIANG Wei;CAI Jialun;FU Yin;ZHANG Rui(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China;State-Province Joint Engineering Laboratory of Spatial Information Technology of High-Speed Rail Safety,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都611756 [2]西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室,四川成都611756

出　　处：《西南交通大学学报》2024年第3期572-580,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(41804009,42071410,41771402);四川省科技计划(2020YJ0322,2020JDTD0003,2018JY0664,2019ZDZX0042,2020JDTD0003,2020YJ0322)。

摘　　要：合成孔径雷达干涉技术(InSAR)受电离层延迟影响较大,特别是在低高纬地区,用于时序InSAR解算的干涉对数量大大减少,严重影响了低频合成孔径雷达(SAR)系统的监测精度.针对该问题,引入重构距离向分谱法(RRSSI),将其扩展为时序InSAR电离层误差估计与校正方法.为测试方法性能,获取2006年6月至2010年8月间覆盖阿拉斯加Anaktuvuk河区域的ALOS-1 PALSAR数据进行实验.实验结果表明:本文方法能够有效估计时序InSAR结果中的电离层误差,且对小空间尺度电离层扰动具有较高的敏感性;经提出方法校正后,研究区域的年平均形变速率均值从校正前的1.46 cm/a降至0.49 cm/a,而标准差则从1.16 cm/a降至0.65 cm/a,精度显著提升;选取时序点的累积形变由校正前的大幅波动变得更加平稳,更符合形变规律.Interferometric synthetic aperture radar(InSAR)is greatly affected by ionospheric delay,especially at low and high latitudes,which decreases the number of available interferometric pairs for time-series InSAR and the monitoring accuracy of low-frequency SAR systems.To this end,the reformulating range split spectrum interferometry(RRSSI)was introduced for the ionospheric error estimation and correction in time-series InSAR.The performance of the proposed method was tested by ALOS-1 PALSAR images covering the Anaktuvuk River area in Alaska from June 2006 to August 2010.The experimental results show that the proposed method can effectively estimate the ionospheric errors of time-series InSAR results and is sensitive to ionospheric disturbances at small spatial scales.After correction,the average annual deformation rate in the study area decreases from 1.46 to 0.49 cm/year,and the standard deviation from 1.16 to 0.65 cm/year,indicating an improvement in monitoring accuracy.Additionally,the cumulative deformation of the selected time-series points becomes more stable than the large fluctuation before correction,which is more consistent with the real deformation.

关 键 词：小基线集-InSAR 电离层校正 距离向分谱法 时序 

分 类 号：P237[天文地球—摄影测量与遥感]