摘要
从机载合成孔径雷达(SAR)距离-多普勒原理出发研究目标定位问题,文中采用多项式拟和平台位置,修正了零多普勒条件方程,建立了适合机载SAR的构像模型和坐标系变换关系,提出了一种实时无参考点定位情况下的雷达图像经纬度计算方法,并对影响定位精度的参数包括平台测量误差、多普勒中心估计误差和载机高度误差进行定量分析,实验结果表明该方法能有效地校正SAR图像存在的几何变形,定位误差精度与理论分析基本一致。
From the principle of airborne SAR range-doppler model,this paper studies the problem of target location.First,the location of the sensor is approximated by polynomials and the condition of zero doppler equation is revised.On this baris,then we propose a fast algorithm to estimate the latitude and longitude of airborne SAR based on R-D equations and coordinate transformations,in which the location of reference points isn＇t required.The parameters including platform measurement error,doppler center error,and platform altitude error which influence location precision are quantitatively analyzed.Finally,the experiment demonstrates that geometric distortion could be calibrated with this method and the results of location precision are consistent with the theoretical analysis.
出处
《现代雷达》
CSCD
北大核心
2010年第3期48-52,79,共6页
Modern Radar
