一维带限Weierstrass分形粗糙地面电磁散射的FDTD研究  

Study on electromagnetic scattering from 1D band-limited weierstrass fractal rough land surface using FDTD

作　　者：朱小敏[1] 任新成[1] 杨小桐[2] 

机构地区：[1]延安大学物理与电子信息学院,延安716000 [2]电子科技大学通信与信息工程学院,成都610054

出　　处：《电子测量技术》2012年第7期32-36,共5页Electronic Measurement Technology

基　　金：陕西省教育厅科技计划项目(11JK0554);陕西省教育厅科研专项项目(2010JK915);延安市科技计划项目(2010kg-07);榆林市科技计划项目

摘　　要：采用一维带限Weierstrass分形函数模拟了实际的粗糙地面,应用时域有限差分方法研究了一维分形粗糙地面电磁散射特性,计算了分形粗糙地面散射的双站散射系数,得出了散射系数随散射角和入射波频率变化的曲线,讨论了高度起伏均方根、分维数、土壤湿度、入射波频率、入射角等参数对散射系数的影响,得到了一维带限Weierstrass分形粗糙地面电磁散射的特性。数值计算结果表明各参数对散射系数均有显著影响,入射波不同极化方式下的散射系数也有明显的变化。e the natural rough land surface. The electromagnetic scattering from 1D fractal rough land surface is studied using FDTD;The bistatic scattering coefficient of fractal rough land surface is calculated; The curves of scattering coefficient with varying scattering angle and frequency of incidence wave is obtained, the influence of the root-mean-square of height fluctuation, dimension of fractal, the moisture capacity of soil,the frequency and angle of incidence wave on the scattering coefficient is discussed; And the characteristics of electromagnetic scattering from the 1D band-limited weierstrass fractal rough land surface is obtained. The numerical results show that the influence of various parameters on the scattering coefficient is obvious. In addition, the scattering coefficients with the changes of the incident polarization modes are also significantly different.

关 键 词：电磁散射 一维带限Weierstrass分形粗糙地面 双站散射系数 FDTD 

分 类 号：TN011[电子电信—物理电子学]