Error modeling and sensitivity analysis for space-borne InSAR baseline configuration measurement

BAO Jie; LIU Xingtan; CHEN Jianwu; LI Lin; ZHAO Chunhui

doi:10.37188/OPE.20243201.0033

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Error modeling and sensitivity analysis for space-borne InSAR baseline configuration measurement

Modern Applied Optics | 更新时间：2024-01-13

- Error modeling and sensitivity analysis for space-borne InSAR baseline configuration measurement
- Optics and Precision Engineering Vol. 32, Issue 1, Pages: 33-42(2024)
- 作者机构：
  
  北京控制工程研究所空间光电测量与感知实验室，北京 100190
- 作者简介：
- 基金信息：
- DOI：10.37188/OPE.20243201.0033
  CLC： TN958
- Published：10 January 2024，
  
  Received：13 September 2023，
  
  Revised：11 October 2023，
- 稿件说明：
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鲍捷,刘兴潭,陈建武等.星载InSAR基线构型测量误差模型与灵敏度分析[J].光学精密工程,2024,32(01):33-42.

BAO Jie,LIU Xingtan,CHEN Jianwu,et al.Error modeling and sensitivity analysis for space-borne InSAR baseline configuration measurement[J].Optics and Precision Engineering,2024,32(01):33-42.
鲍捷,刘兴潭,陈建武等.星载InSAR基线构型测量误差模型与灵敏度分析[J].光学精密工程,2024,32(01):33-42. DOI： 10.37188/OPE.20243201.0033.

BAO Jie,LIU Xingtan,CHEN Jianwu,et al.Error modeling and sensitivity analysis for space-borne InSAR baseline configuration measurement[J].Optics and Precision Engineering,2024,32(01):33-42. DOI： 10.37188/OPE.20243201.0033.

摘要

为避免双天线InSAR系统基线测量动态监测过程中引入误差，影响基线测量精度，对基线长度与角度测量过程中的可能误差进行定性与定量分析。采用坐标变换法建立系统误差数学模型，明确测量系统的误差来源。提出误差灵敏度概念，对误差项进行定量计算，并对每一自由度的误差源进行灵敏度分析，进一步形成综合误差定量合成结果。根据误差灵敏度系数给出一组精度反演误差分配案例。最后，依据蒙特卡洛法在MATLAB平台闭环验证精度量化分配方法的可行性与稳定性。仿真分析结果表明，激光视觉三轴位置的测量精度要求为300 μm（3

），三轴角度的测量精度要求为50''（3

），即可满足基线长度精度1 mm（1.6

），基线角度精度2''（1.6

）。通过本方法可由测量环境条件输入直接获得基线测量的精度，根据灵敏度系数对误差分配进行反演可以得到系统最优布局，其结果可为测量系统的方案设计与精度分解提供有效指导。

Abstract

Possible errors in baseline length and angle measurements are qualitatively and quantitatively analyzed to reduce errors in the dynamic monitoring of baseline measurements of the dual-antenna InSAR system that affect the baseline measurement accuracy. First， by establishing a systematic error model， the error source of the measurement system was identified. The error sensitivity was introduced to quantitatively estimate the error term and conduct sensitivity analysis of the error term for each degree of freedom， further generating quantitative synthesis results of the comprehensive error. A set of accuracy inversion error assignment cases was analyzed. The Monte Carlo method was used to verify the feasibility and robustness of the proposed method for accurate quantitative analysis allocation in a simulation closed-loop. The simulation analysis results show that when the accuracy of the position measurements is 300 μm （3σ）， and the accuracy of the triaxial angle measurements is 50'' （3σ）， the baseline length accuracy can reach 1 mm （1.6σ）， and the baseline angle accuracy is 2″ （1.6σ）. By using this method， the accuracy of baseline measurements can be obtained directly from the input of the measured environmental conditions. The inversion of the error assignments according to the sensitivity coefficient yields the optimal layout of the system. The results are valuable for effectively guiding scheme designs and analyzing the error distribution of the measurement system.

关键词

干涉合成孔径雷达基线测量误差模型灵敏度分析

Keywords

interferometric synthetic aperture radar（InSAR）baseline measurementerror modelsensitivity analysis

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