机载SAR目标快速定位方法和定位精度分析

Study on a Fast Target Location Method for Airborne SAR and Location Precision Analysis

从机载合成孔径雷达数据采集几何关系和成像原理的角度研究目标定位问题 ,提出了一种分别从距离和方位两个方向对目标进行快速定位的方法 ,给出了从雷达图像上目标点像素坐标计算其经纬度的详细过程 ,同时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、系统时间延迟测量误差和目标高度误差做了定量分析 ,通过实验对该方法进行了验证 。

From the data collection geometry and imaging principle of airborne SAR, this paper mainly studies the problem of target location. A new method of fast location including range location and azimuth location is presented. The detailed procedure is provided for computing the longitude and latitude of the target from the pixel point coordinate in the SAR image. The same time parameters including platform measurement error, Doppler center error, time delay measurement error and target altitude error which influence location precision are quantitatively analyzed. Finally an experiment is made and results are consistent with the theoretical analysis.