基于直接算法的合成孔径雷达干涉测量几何精度分析

直接将绝对相位差引入距离方程和多普勒方程答解地面点坐标,称为合成孔径雷达干涉测量直接算法。利用引入含有合理误差的模拟InSAR像坐标、绝对相位差和相应的轨道参数作为起算数据,求得含有误差的地面点坐标,实现了InSAR直接算法的几何精度分析。为了把基线长度和姿态的误差引入轨道空间位置,提出了相应的数学模型。计算结果表明,直接算法与经典算法精度基本相同。

The Analysis of Geometric Accuracy of the Interferometric Synthetic Aperture Radar Measuring Based on Direct Algorithm

The direct algorithm of interferometric synthetic aperture radar measuring is to directly introduce the absolute phase difference into range equation and Doppler equation to resolve the ground coordinates. By using the ideal image coordinate, absolute phase difference and orbital position of InSAR which include reasonable errors as the initial data, we can get the ground coordinates which include the errors and realize the analysis of geometric accuracy of the ground coordinates. In order to introduce the errors of the baseline length and attitude into orbital position, we propose the corresponding mathematical model. The computation results show that the accuracy of direct algorithm is almost the same as that of the classical algorithm.