一种合成孔径雷达对地面运动目标成像和精确定位的算法

该文针对正侧视合成孔径雷达工作体制下运动目标成像、定位问题进行研究。分析了运动目标成像与静止目标成像的异同。提出利用距离历程拟合,结合静物场景成像的部分已知信息(地面道路或者桥梁的方向),准确估计t=0时刻目标的坐标和两维速度,不仅为运动目标精确成像提供了信息,同时得到目标运动轨迹相对地面场景的准确位置。该文提出的方法对于目标在照射孔径内的位置没有特殊假设(以往研究的时频分析方法需要假设目标在t=0时刻位于载机的正侧方向)。最后定量分析了不同形式匹配滤波器对运动目标回波成像的效果以及采用静止目标匹配滤波器对运动目标回波进行成像处理而产生的移位和散焦影响.

An Effective Method for Ground Moving Target Imaging and Location in SAR System

This paper addresses the research of ground moving target imaging and positioning in Synthetic Aperture Radar (SAR) system. First it analyzes the difference between ground moving target imaging process and that for stationary ones. The method brought forward in this paper uses the direction of road and bridge of the gazing ground as prior known knowledge, and it can accurately estimate the coordinates and velocities of the moving targets while t = 0. It means that the method can get the position of the moving targets and image them with the same precision as stationary targets imaging in SAR system. There is no special postulation in the proposed algorithm contrast to the conventional method which always assumes that the targets located on the vertical side of SAR at the point of t = 0. Finally two different forms of matched filters are given out for moving targets imaging and the different results are analyzed. The smearing and position shifting effect when using stationary target matched filter to process the moving target echo is also analyzed at the last part.