重轨星载InSAR形变监测中一种改进的大气延迟相位校正方法  

An Improved Atmospheric Phase Delay Correction Method inSpaceborne Repeat-Track InSAR Monitoring

作　　者：祝杰 李瑜 王坦 常占强[2] 于文 韩宇飞 王阅兵 刘洋洋 ZHU Jie;LI Yu;WANG Tan;CHANG Zhanqiang;YU Wen;HAN Yufei;WANG Yuebing;LIU Yangyang(China Earthquake Networks Center,5 Nanheng Street,Sanlihe,Beijing 100045,China;College of Resource Environment and Tourism,Capital Normal University,105 North-Xisanhuan Road,Beijing 100048,China)

机构地区：[1]中国地震台网中心,北京市100045 [2]首都师范大学资源环境与旅游学院,北京市100048

出　　处：《大地测量与地球动力学》2020年第11期1164-1169,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局“三结合”课题(3JH-202001114);国家重点研发计划(2018YFC1503606);北京市自然科学基金(8204077)。

摘　　要：在传统空间辐射计方法基础上,将对流层中水汽垂直分层效应集成到校正模型中,提出一种改进的InSAR大气延迟相位校正方法。为验证改进方法的可行性,利用MERIS近红外水汽产品去除北京地区地面沉降InSAR监测中的大气延迟相位。以陆态网络GNSS站点监测结果为基准,验证改进的大气校正方法的监测精度。改进的大气校正方法、空间辐射计校正法和未校正的InSAR监测结果与陆态网络GNSS站点监测结果对比显示,均方根误差分别为0.388 cm、0.603 cm、0.685 cm,表明改进的方法相比于未校正和传统方法具有更高的精度,能有效削弱干涉图中的大气延迟相位误差。Based on conventional space radiometer method,we integrate the vertical stratification effect of water vapor in troposphere into the correction model,and propose an improved InSAR atmospheric phase delay correction method.To validate the feasibility of the proposed method,the MERIS near-infrared water vapor product is used to reduce the atmospheric phase delay in ground subsidence InSAR monitoring in Beijing.The deformation monitoring results of GNSS stations of crustal movement observation network of China(CMONOC)are used as benchmarks to verify the monitoring accuracy of the improved atmospheric correction method.The results show that RMSE of the improved atmospheric correction method,space-based radiometer method and uncorrected InSAR monitoring results are 0.388 cm,0.603 cm and 0.685 cm,respectively,compared with the monitoring results of CMONOC GNSS stations,which shows that the improved atmospheric correction method is with higher monitoring accuracy than uncorrected and conventional method,and can effectively reduce the atmospheric phase delay errors in SAR interferograms.

关 键 词：INSAR 大气延迟相位 MERIS 地面沉降 陆态网络 

分 类 号：P237[天文地球—摄影测量与遥感]