利用MODIS水汽数据进行ASAR干涉测量大气改正研究

Correction of atmospheric effect in ASAR interferogram using MODIS data

摘要: 对流层水汽引起的大气相位延迟是制约重复轨道InSAR 高精度测量的重要因素之一。为有效解决InSAR 中大气相位延迟的问题,对InSAR 中大气延迟误差进行了分析,研究了利用MODIS 水汽数据对ASAR 干涉图大气改正的方法及其关键技术,并以太原地区的ASAR 干涉图为例,对其进行大气改正。实验结果表明,MODIS/ASAR 大气改正方法可以显著地提高干涉图的质量,同时形变反演的精度也得到了明显的改善,验证了MODIS 与ASAR 数据融合获取地表形变信息的必要性和可靠性。

Abstract: The atmospheric phase delay caused by tropospheric water vapor is an important factor to the precision of repeat pass InSAR. In order to solve the problems in InSAR atmospheric phase delay effectively, the atmospheric delay error of InSAR was analyzed, and the atmospheric correction methods and key technology using MODIS water vapor data for ASAR interferograms were presented. Then, the atmospheric corrections was conducted using ASAR interferometric pair over the Taiyuan region as examples. The experimental results show that the quality of interferogram can be improved greatly by the MODIS/ASAR atmospheric correction method, and the deformation inversion accuracy can be significantly improved, the necessity and reliability of MODIS and ASAR data fusion form obtaining information of surface deformation are aslo verified.