船载双天线InSAR边坡形变监测

Ship-borne dual-antenna InSAR slope deformation monitoring

差分干涉测量技术(D-InSAR)是一种利用不同时相SAR数据获取形变信息的遥感技术,目前已经被广泛应用于大范围的地表形变监测。各种InSAR传感器搭载平台被应用于不同的空间尺度研究,包括星载、机载、车载和地基InSAR等,小范围江河边坡监测在可以进行对岸观测条件下,目前主要使用固定式地基InSAR监测,但是地基InSAR布设周期较长、成本较高,本文提出一种移动式船载InSAR形变监测技术,并根据船载InSAR成像几何设计一种船载双天线InSAR形变监测模型,该模型使得近距离观测船载InSAR系统在未达到H>>h和R>>h的条件下同样满足■的假设。本文选择云南省澜沧江流域进行试验,并利用角反射器(triangle corner reflector, TCR)模拟形变和评估形变结果的精度。试验结果表明,利用本文提出的船载InSAR技术能够获得2 cm内的视线方向(line of sight, LOS)形变误差。船载InSAR技术适用于江河流域的边坡形变监测,对水利设施的灾害监测和预警具有重要意义。

Differential synthetic aperture radar interferometry(D-InSAR)is a remote sensing technology that uses SAR data in different phases to obtain deformation information.It has been widely used in large-scale surface deformation monitoring.Various InSAR sensor-carrying platforms are used in different spatial scale research,including space-borne,airborne,vehicle-mounted and ground-based InSAR,etc.In small-scale river slope monitoring,under the condition that the opposite bank can be observed,fixed ground-based InSAR monitoring is mainly used at present.However,the ground-based InSAR deployment cycle is long and the cost is high.This study proposes a mobile shipborne InSAR deformation monitoring technology.And according to the ship-borne InSAR imaging geometry,a shipborne upward-looking dual-antenna InSAR deformation monitoring model is designed.This model enables the close-up-looking ship-borne InSAR system to meet the same conditions ofδ=-0=0 under the condition that H h and R h are not reached.We conducted experiments in the Lancang River Basin in Yunnan Province,using corner reflectors(triangle corner reflector,TCR)to simulate the deformation and evaluate the accuracy of the deformation results.The experimental results show that the ship-borne InSAR technology proposed in this paper can obtain the Line of Sight(LOS)deformation error within 2 cm.Shipborne InSAR technology is suitable for slope deformation monitoring in river basins,and is of great significance for disaster monitoring and early warning of water conservancy facilities.