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为了克服时域有限差分(FDTD)的缺陷我们引入辛算法理论(SFDTD),结合辛算法的稳定性分析了海面与其上方目标的复合电磁散射特性,并分析了入射角度,风速等对复合散射特性的影响,首先给出了Weiersstrass分形海面模型,数值结果表明分维度和风速的变化都会引起海面的粗糙程度很大的变化,同时目标的存在对海面散射影响很大,它使得海面的散射能量会有相应的增加,并且风速的增大使得海面粗糙度增大,这样在其他方向上散射逐渐增强,而在镜像方向上的增强越来越不明显。
In order to overcome the shortcomings of finite difference time-domain (FDTD), we introduce symplectic algorithm theory (SFDTD), and combine the stability of symplectic algorithm to analyze the composite electromagnetic scattering characteristics of the sea surface and the above target. The effects of incident angle and wind speed on the complex scattering characteristics We first present the Weiersstrass fractal sea surface model. The numerical results show that both the fractal dimension and the wind speed cause a great change in the roughness of the sea surface, and the influence of the target on the scattering of the sea surface greatly influences the scattering energy of the sea surface And the increase of the wind speed makes the sea surface roughness increase, so the scattering in other directions gradually increases, while the enhancement in the mirror direction is less and less obvious.