星载InSAR基线构型测量误差模型与灵敏度分析  

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

作　　者：鲍捷 刘兴潭 陈建武[1] 李林 赵春晖[1] BAO Jie;LIU Xingtan;CHEN Jianwu;LI Lin;ZHAO Chunhui(Space Optoelectronic Measurement and Perception Laboratory,Beijing Institute of Control Engineering,Beijing 100190,China)

机构地区：[1]北京控制工程研究所空间光电测量与感知实验室,北京100190

出　　处：《光学精密工程》2024年第1期33-42,共10页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.52275083)。

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300μm(3σ),三轴角度的测量精度要求为50″(3σ),即可满足基线长度精度1 mm(1.6σ),基线角度精度2″(1.6σ)。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。Possible errors in baseline length and angle measurements are qualitatively and quantitatively an⁃alyzed 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 quantita⁃tively 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 er⁃ror assignment cases was analyzed.The Monte Carlo method was used to verify the feasibility and robust⁃ness 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 300μm(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 

分 类 号：TN958[电子电信—信号与信息处理]