粗糙面电磁散射的SSA方法研究

Electromagnetic Scattering from the Rough Surface by the SSA

采用小斜率近似方法研究了粗糙面的电磁散射问题,给出了小斜率近似下散射截面的级数展开,得到了满足高斯谱分布的导体粗糙面一阶、二阶、三阶小斜率近似下双站散射截面结果,同时将小斜率近似与考虑遮蔽效应的基尔霍夫近似和有关实验测量结果作了比较.研究表明,小斜率近似在整个入射角范围内较为准确,在散射角较大时与实际测量结果也较为吻合.小斜率近似是一种处理粗糙面电磁散射问题的较好方法.

Electromagnetic scattering from the rough surface by the Small Slope Approximation （SSA） is studied. A systematic expansion of the scattering cross section can be interpreted as series in generalized surface slope, the bistatic scattering cross sections for Gaussian conducting rough surface in the order of the first, sec- ond and third Small Slope Approximation are obtained. The results from the Small Slope Approximation are also compared with that of the Kirchhoff approximation （KA） with shadowing effect and the experimental data. It is found out that the Small Slope Approximation is more accurate for the whole incident angle and the numerical resuits also show good agreement with the experimental data for the large scattering angle. It is concluded that SSA is a good method to deal with the electromagnetic scattering from the rough surface.