大入射余角下的海杂波建模方法研究

Research on Sea Clutter Modeling Methods at High Grazing Angles

大入射余角下的海杂波模型适用于探测雷达发现强海杂波下的隐蔽目标,是目前最新的一种雷达海杂波回波建模方法。基于随时间变化的海表面动态模型和依赖探测雷达波束几何分割的有效照射区域模型,计算出的照射区域内海杂波回波是由该区域分割的众多散射单元的回波合成的。根据雷达特性将海表面用网格分割成小块,相关模型中的每一块都可当做一个RCS单元,仿真结果证实了杂波模型的有效性。

The modeling of sea clutter under large grazing angles plays roles in detecting the targets buried in heavy clutters for seeker radar. A novel radar echo modeling method of sea clutter is presented. Based on the time-variant sea surface dynamic model and the valid illumination area model which is depended on the geometries between seeker radar beam and sea surface, the radar echo of sea clutter in the area is then calculated by synthesizing echoes from all patches in illumination area. The patches of sea surface are genera- ted by making grids on the region of interest according to the radar parameters. And each patch is treated as a single scatter,of which RCS is decided by dependency relation models. The simulation results show the validity of clutter model.