分布式InSAR三维定位的闭合形式解及其精度分析

本文对分布式InSAR(Synthetic Aperture Radar Interferometry)目标三维定位的空间几何关系和工作原理进行了分析,给出了完整的目标定位闭合形式解;对闭合形式解进行灵敏度分析,给出了定位精度指标与系统参数精度指标之间关系的解析表达式;分析表明目标定位几何结构的好坏主要取决于视线矢量、基线矢量和主星速度矢量的空间角位置关系,其中视线、基线平面与视线、速度平面间的二面角是一个关键参数,该二面角越大,几何结构越好.最后在以ENVISAT作为主星、采用"干涉车轮"编队的InSAR系统中,给出了精度指标传递关系的蒙特卡洛仿真验证.

Closed-Form Solution of Distributed InSAR Geolocation and Its Precision Analysis

This paper analyses the geometry and principle of distributed InSAR(Synthetic Aperture Radar Interferometry) geolocation,and provides a complete closed-form solution to the geolocation problem.Meanwhile,it analyses the sensitivity of the closed-form solution,and proposes the formulations of geolocation precision criterion and system parameters precision criterion.The analysis indicates that the property of geolocation geometry is determined by the angle among sightline vector,baseline vector and master satellite speed vector.The angle made up of sightline-baseline plane and sightline-speed plane is a key parameter,and the bigger the angle,the better the geolocation geometry is.Finally,in Cartwheel formation,a Monte Carlo simulation is performed to prove that the precision analysis is correct.