粗糙面电磁散射的小斜率近似方法研究

Study of electromagnetic scattering from the rough surface using the small slope approximation

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.数值结果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.

Electromagnetic scattering from the rough surface using the small slope approximation is investigated, which gives a systematic expansion of the scattering cross section that can be interpreted as a series in the generalized surface slope, with the bistatic scattering cross sections for the Gaussian conducting rough surface under the first, second and third-order small slope approximation obtained. The results by the small slope approximation are also compared with those of the Kirchhoff approximation with the shadowing effect considered and the experimental data, which shows that the small slope approximation is more accurate for the whole region of the incident angle and the numerical results also show good agreement with the experimental data for the large scattering angle.