基于距离约束的InSAR长基线高精度动态测量方法

摘要

为了获得高精度的高程信息,干涉SAR系统需要采用长基线结构,进而要求对长基线进行高精度的动态测量.该文针对单相机和激光测距仪组合基线测量系统,提出了一种新的基于距离约束的基线联合动态解算方法.该方法通过对空间后方交会模型增加距离约束条件,实现了对双天线干涉基线的高精度测量.论文对该方法进行了原理性分析和地面实验验证,该方法在约50 m的摄影距离处基线长度测量精度优于1 mm,姿态角精度优于60",实验结果验证了该方法的有效性和可行性.%In order to obtain high accuracy of high elevation, long baseline structure is normally used for Interference Synthetic Aperture Radar (InSAR) system. The dynamic and high accuracy measurement of long baseline is necessary. In this paper, a method for dynamic measurement for long baseline using single camera and laser rangefinder system based on distance constraint is proposed. It realizes high accuracy measurement by adding the distance equation to single image space resection mode for constraint. The analysis of principle and experiments are carried out in this paper. The errors of position and attitude are less than 1 mm and 60 arc-seconds obtained by this method in about 50 m photography distance. Experiments show the validity of the method.