川藏交通廊道典型工点InSAR监测及几何畸变精细判识

Monitoring Typical Construction Sites of Sichuan-Tibet Traffic Corridor by InSAR and Intensive Distortion Analysis

为了探明川藏交通廊道典型工点高陡岸坡的稳定性,以及明确SAR(synthetic aperture radar)几何畸变对InSAR(interferometric synthetic aperture radar)形变结果的影响,利用时序InSAR技术开展川藏交通廊道典型工点高陡岸坡形变监测,并提出了一种可识别所有几何畸变类型的SAR几何畸变精细判识方法 .成功识别出9处不稳定的高陡岸坡,获取了各轨道SAR几何畸变精细识别结果 .在精细划分几何畸变的前提下,通过进一步地将几何畸变与形变结果联合分析,首次揭示了各类几何畸变(包括透视收缩、主被动叠掩、主被动阴影)对InSAR形变结果的影响效果.研究明确了InSAR技术在川藏交通廊道高陡山区的应用能力、适用范围以及几何畸变区结果可靠性的判识,可为后续高陡岸坡形变监测、精确解译等研究提供重要参考.

To determine the stability of high steep bank slope and clarify the influence of SAR(synthetic aperture radar) geometric distortion on the InSAR(interferometric synthetic aperture radar) displacement results in typical construction sites of the SichuanTibet traffic corridor,in this paper it uses time series InSAR technique for monitoring the deformation of steep slopes in typical construction sites of the Sichuan-Tibet railway,and proposes an intensive SAR geometry distortion analysis method which can identify all types of geometric distortion.9 unstable steep slopes were successfully identified,and the intensive SAR geometric distortion results of different orbits were acquired.In the prerequisite condition of intensive distortion classification,the influences of different geometric distortion(including foreshortening,active layover passive layover,shadow,and active passive shadow) on InSAR displacement results for the first time revealed by combining geometric distortion and deformation results.This research reveals the application capability and scope of InSAR technique,and the reliability of the InSAR measurement in geometric,providing important reference for subsequent on research of steep slope deformation monitoring and accurate interpretation.