考虑运动补偿的机载SAR定位误差传递模型及航迹标定方法  

Geolocation Error Transfer Model and Trajectory Calibration Method for Airborne SAR Considering Motion Compensation Residual Error

作　　者：高铭[1,2,3] 仇晓兰 孟大地[1,2] 黄丽佳 丁赤飚[1,2,3] GAO Ming;QIU Xiaolan;MENG Dadi;HUANG Lijia;DING Chibiao(Key Laboratory of Technology in Geospatial Information Processing and Application System,Chinese Academy of Sciences,Beijing 100190,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空间信息处理与应用系统技术重点实验室,北京100190 [2]中国科学院空天信息创新研究院,北京100190 [3]中国科学院大学,北京100049

出　　处：《雷达学报（中英文）》2021年第4期646-655,共10页Journal of Radars

基　　金：国家自然科学基金(62022082,61991424)。

摘　　要：机载合成孔径雷达(SAR)定位误差不仅受载机位置/速度测量误差、系统时间误差等的影响,还与运动补偿残余误差有关。然而现有机载SAR定位模型很少考虑运动补偿误差的影响。该文针对实际中普遍存在的含运动误差和载机航迹测量误差的情况,结合运动补偿和频域成像算法,推导了机载SAR图像定位误差传递模型,阐明了运动补偿残余误差影响下航迹测量误差对定位偏差的影响方式,并基于该模型给出了载机航迹测量误差的标定方法。仿真实验验证了该定位误差传递模型的正确性,相比于不考虑运动补偿残余误差的定位模型,得到了更高精度的航迹测量误差标定结果,证明了该方法的优越性。Airborne Synthetic Aperture Radar(SAR)location error is affected by the position/speed measurement error of the aircraft,system time error,etc.,and also related to the residual error of motion compensation.However,the existing airborne SAR location model rarely considers the effect of residual motion error.Considering that motion and trajectory measurement errors are common in practice,this paper derives a location error transfer model of an airborne SAR image based on the motion compensation and frequencydomain imaging algorithms.The proposed model clarifies the influence of trajectory measurement error on location deviation when residual motion error exists and provides a method of error calibration measurement.The simulation experiments validate the correctness of the proposed location error transfer model.The present method obtains a more accurate error calibration measurement result than the location error model that does not consider the residual motion error,proving the superiority of the proposed model.

关 键 词：机载合成孔径雷达 定位误差传递模型 航迹测量误差标定 运动补偿 频域成像算法 

分 类 号：TN957.52[电子电信—信号与信息处理]