粗糙海面上舰船Kelvin尾迹的电磁散射仿真

Electromagnetic scattering simulation of Kelvin wake in rough sea surface

基于点源扰动方法建立了舰船的Kelvin尾迹模型,模拟了不同船速下的Kelvin尾迹.实际中,舰船尾迹除了受到舰船自身参数影响外,还会受到风驱海浪的调制.为了建立更为符合实际的Kelvin尾迹模型,借助PM(Pierson-Moscowitz)海谱生成粗糙海面,将其与Kelvin尾迹模型进行线性叠加后,得到了粗糙海面上舰船尾迹.在该复合模型基础上,利用物理光学法获得了不同入射情况下的单站、双站的雷达散射截面,实现了海面舰船尾迹电磁散射的模拟仿真.这一过程的实现,有利于更好地模拟舰船尾迹在合成孔径雷达(Synthetic Aperture Radar,SAR)中的成像仿真,同时为SAR成像中舰船尾迹以及舰船自身的识别奠定了基础.

Based on the Kelvin wake model by the point-source disturbance method,ship wakes at different speeds are simulated.In practical terms,the ship wake is not only affected by the parameters of ship,but also modulated by the wind-driven ocean waves.In order to build a better model,the ship wake in the rough sea surface is obtained by the linear summation of the rough sea surface produced by the Pierson-Moscowitz（PM）spectrum and the Kelvin wake.Utilizing the composite model,the variation of the single and bistatic radar cross sections（RCS）with scattering angles are investigated by the physical optics（PO）method.The simulation of the electromagnetic scattering of ship wake in rough sea surface is achieved.The realization of this process will be useful for a better simulation of the Kelvin wake in synthetic aperture radar（SAR）imaging,and provide a foundation for the recognition of vessel and its wakes.