基于Keystone变换的地面运动目标检测研究

合成孔径雷达 (SAR)在检测地面运动目标中所面临的难题之一是距离和速度的耦合导致了地面运动目标在SAR图像中模糊、错位、甚至消失。分析了Keystone变换的原理 ,提出了Keystone变换在一般正侧式SAR系统具体实现的方法与步骤 ,分析了Keystone方法对不同运动类型目标成像效果的修正作用。最后通过仿真证明了实现方法和分析结果的正确性。

Ground Moving Target Detection With an SAR System Based on Keystone Transform

It is difficult to detect and image a ground moving target by synthetic aperture radar (SAR) since the echo of the moving target is the LFM with unknown modulation rate. The moving targets in SAR image are smeared or displaced, even disappear. First we study the principle of Keystone transform and give out a process to realize it in normal SAR image algorithm. Then we analyze the different Keystone transform effects on different kinds of moving targets. The simulation results have confirmed our conclusions and our viewpoints.;