一种舰船目标SAR回波的快速仿真方法

为满足合成孔径雷达(synthetic aperture radar,SAR)在海洋遥感的应用需求,提出一种舰船目标SAR成像的快速仿真方法。对成像场景中重点关注的目标进行精确电磁建模,并利用"四路径"模型计算目标与海面的复合散射回波,对海面背景采用散射面元法计算回波;将舰船复合散射回波与海面回波进行合成得到总的SAR回波,利用聚束SAR成像处理方法获得SAR图像。结果表明:该算法避免了对整个成像区域进行复杂的电磁仿真,能够有效降低对海面大场景的电磁计算效率。由于在目标区域采用高频电磁算法,保留了目标的电磁散射的精细结构,为精确模拟SAR回波提供了一种准确而高效的仿真算法。

A Fast Simulation Method for Ship Target SAR Signal Echo

In order to meet the application requirements of synthetic aperture radar (SAR) in ocean remote sensing, a fast simulation method for the ship target SAR echo generation is presented, which carries out the accurate electromagnetic modeling to the important ship targets. “Four paths" model is used to calculate the complex echo between the ship target and sea surface, and the facet model is used to model the sea surface backscattering. After the two parts of echoes being synthesized, the SAR echo of whole scene is gotten, and the echo is processed by spot SAR imaging processing algorithm to verify the effectiveness. The proposed fast method, avoids the complex electromagnetic simulation on the whole imaging area, effectively improves the electromagnetic calculation efficiency on big scene. By applying the high frequency electromagnetic algorithm in the target area, the electromagnetic scattering property of the ship target is retained, which provides an accurate and efficient simulation algorithm for the SAR echo simulation.