低掠入射时分形粗糙面散射的高阶微扰解  

Scattering from a fractional rough surface by high-order perturbation method at low grazing angle

作　　者：童创明[1] 黄泽贵[1] 胡国平[1] 王积勤[1] 

机构地区：[1]空军工程大学导弹学院,陕西三原713800

出　　处：《电波科学学报》2007年第1期148-152,共5页Chinese Journal of Radio Science

基　　金：陕西省自然科学基金(2005F23)

摘　　要：针对粗糙表面低掠入射散射特性求解的大误差问题,采用高阶微扰法研究了分形布朗运动粗糙表面在低掠入射条件下的散射特性,计算了高阶微扰法在低掠入射时的修正值,比较了高阶场量和阴影函数对低掠入射的修正效应,讨论了不同分维数下低掠入射时的散射系数,分析了低掠入射下极化指数与不同幂次正割函数的拟合逼近问题,修正了Ngo等人的结论。结果表明,高阶微扰法能有效求解掠入射角下分形粗糙表面的散射特性。The traditional analytical and numerical method could not analyze the scattering characteristic of rough surface at low grazing angle （LGA） effectively, a high-order small perturbation method （HSPM） was adopted in this paper. For scattering from a fractional Brownian motion （iBm） rough sea surface at LGA condition, the modified values at different incidence angle were obtained by HSPM, the behavior of scattering with different fractal dimension at LGA was analyzed, the polarized exponent of co-polarized scattering with different power of secant function was discussed, and the Ngo＇s conclusion is modified. The simlution results were good agreement with a set of measured data. This shows that the HSPM can solve effectively the scattering from a fractional rough surface at more extensive angles.

关 键 词：分形粗糙表面 低掠入射 极化指数 高阶微扰法 

分 类 号：O411.3[理学—理论物理]