| 摘要: |
| 星载分布式干涉合成孔径雷达(Interferometic Synthetic Aperture Radar, InSAR)系统编队缠绕飞行,双星姿态相对变化导致基线系统误差动态变化,单定标场地基线定标结果求均值的传统基线估计方法无法有效适用于未定标弧段。针对这一问题,本文提出了一种基线估计方法。该方法对基线系统误差及双星各自系统误差进行分析,将基线定标结果转换至卫星系统误差,然后结合未定标弧段卫星轨道参数、运动姿态完成该弧段的基线误差推算。本文仿真了卫星飞行过程中传统基线估计方法和本文所提基线估计方法对应的测量高程差和相对姿态以及卫星系统误差的变化关系,并采用我国星载分布式InSAR系统实测数据进行实验验证。实验结果表明本文所提基线估计方法相较于传统基线估计方法能够提高未定标弧段的地面高程测量精度,为星载分布式InSAR系统基线定标结果应用提供一种新方法。 |
| 关键词: 星载分布式InSAR 基线估计方法 系统误差 基线定标 |
| DOI： |
| 分类号:TN957.52 |
| 基金项目:空基SAR定标软件（E0H2081302） |
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| Research on Baseline estimation method based on attitude analysis of spaceborne distributed InSAR system |
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王亚芬
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| Abstract: |
| Spaceborne distributed Interferometic Synthetic Aperture Radar (InSAR) system flying in formation winding, the relative attitude change of the two satellites leads to the dynamic change of the baseline system error. The traditional baseline estimation method of calculating the mean value of baseline calibration results for a single calibration site cannot be effectively applied to uncalibrated arcs. In this paper, we propose a baseline estimation method to solve this problem. The baseline system error and the system error of the two satellites are analyzed, and the baseline calibration result is converted to the satellite system error. Then the baseline error of the uncalibrated arc is calculated by combining the orbit parameters and motion attitude of the satellite. The variations of the elevation difference, the relative attitude and the system error of the traditional baseline estimation method and the proposed baseline estimation method during the flight of the satellite are simulated, and the experimental results are verified by the measured data of the Chinese spaceborne distributed InSAR system. The experimental results show that the proposed baseline estimation method can improve the ground elevation measurement accuracy of the uncalibrated arc compared with the traditional baseline estimation method, and provide a new method for the application of baseline calibration results of spaceborne distributed InSAR system. |
| Key words: spaceborne distributed InSAR baseline estimation method systematic error baseline calibration |