弹载SAR大斜视扩展CS成像算法

Extended Chirp Scaling Approach for Onboard High Squint SAR

针对弹载合成孔径雷达大斜视工作模式下图像几何失真和成像匹配过程中的图像失配问题展开研究,通过分析巡航导弹攻击末段飞行特性,提出了一种采用距离向变标处理的扩展CS算法。该算法可以校正因大斜视带来的图像几何失真,能够用于末制导景象匹配。点目标和分布式目标仿真结果证明了算法的有效性,与传统的CS算法的对比证明了算法的优越性。

By analyzing terminal flight of cruise missile, the geometric distortion under high squint SAR and scene mismatching were studied. Based on the extended chirp scaling algorithm, a novel range scaling formulation was proposed for geometric correction processing of high squint data and scene matching of terminal guidance. The simulation result shows the superiority of the proposed algorithm compared with the traditional CS algorithm.