单航过单平台InSAR基线模型的敏感性分析

Sensitivity Analysis of the Baseline Model for the Single-Pass Single-Platform InSAR

从单航过单平台InSAR系统对其自身基线的高精度需求出发,给出了光学测量方案下的基线模型,并针对模型中的各因素及其误差来源,进行了模型的敏感性分析,阐明了测量元素与位置修正矢量的基线矢量的误差传递关系,然后根据误差传递关系找出测量系统的优化安装部位。通过解析推导得出各类误差源在不同条件下对基线精度影响的理论结果,由仿真分析给出了不同安装部位的误差传递系数。通过敏感性分析可由测量环境的输入条件直接获得基线的误差量级,其结果可作为指导测量系统方案设计与精度分配的参考依据。

An optical measurement scheme based baseline model is presented for the single-pass single-platform InSAR system in this paper.From the perspective of the high accuracy demand for the baseline,the factors and their error sources in the model are summarized.And the sensitivity analysis of the model is carried out.The error propagation relations from the measurement elements and the position modification vector to the baseline vector are illustrated.And then the relations are also applied to locate the optimal installation position of the measurement system.The analytical deduction is used to demonstrate the theoretical conclusions of influences of error sources on the baseline accuracy under various circumstances.Simulations show error propagation coefficients in different installation positions.The orders of magnitude of baseline errors resulted from inputs of the measurement environment can be obtained directly through the sensitivity analysis,and these results can give a reference to the measurement system scheme design and the accuracy budget allocation.