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机载SAR运动补偿残余误差建模及影响分析 被引量:1

Analysis of Residual Errors in SAR Motion Compensation
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摘要 在基于运动传感器测量数据的机载SAR运动补偿方法中,IMU/GPS测量误差和地物定位误差等非理想因素的存在会导致相位补偿量的不准确,进而引入残余运动误差,影响SAR图像质量。本文针对IMU的各项测量误差、系统延时误差、多普勒中心频率误差、参考DEM误差等影响轨迹测量和地物定位精度的具体因素展开研究,建立了上述因素与残余运动误差之间的函数关系。该函数关系显示,残余运动误差主要来源于航迹测量误差和地物定位误差,航迹测量误差主要根源于IMU/GPS测量单元中加速度计的常值漂移和IMU关于姿态角的测量误差,地物定位误差主要根源于参考DEM误差等因素。本文通过建模分析,完成了对机载SAR运动补偿精度退化机理的研究。
出处 《测绘通报》 CSCD 北大核心 2015年第1期44-49,62,共7页 Bulletin of Surveying and Mapping
基金 国家自然科学基金(61302165)
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