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中文摘要：
根据机载聚束SAR成像几何关系及线性RD成像算法,对SAR图像的定位精度进行了深入探讨.由于现有的惯性导航系统大多精度不高,并不能准确提供载机的真实运动信息,利用这些参数进行成像处理会使目标偏离真实位置.本文主要分析惯性导航系统提供的载机飞行参数对机载SAR定位精度的影响,建立定位方程并推导出定位误差解析公式.最后对机载SAR图像定位精度进行仿真分析与实测数据处理验证,处理结果表明载机的视线方向的速度误差和载机的位置误差是影响SAR图像定位精度主要因素.
英文摘要：
From the principle of linear RD algorithm and model of airborne spotlight SAR,this paper studies airborne spotlight SAR geolocation accuracy.Firstly,the effect of the radar parameters on the airborne SAR geolocation accuracy is analyzed,and these parameters are mostly platform motion errors from the onboard GPS and INS devices.Then,the formulas of airborne spotlight SAR geolocation errors are given.Finally,simulation results and experimental results using the data collected by an experimental airborne SAR are employed to verify the proposed analysis approach.This paper provides useful reference for the design of the geolocation accuracy of airborne SAR system.
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Range Doppler Algorithm for bistatic SAR processing based on the improved loffeld's bistatic formula
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