【摘要】 分别使用指数型分布和高斯型分布表示沙漠表面的高度起伏状况，采用蒙特卡罗方法模拟横向沙丘表面和沙丘与沙丘间平坦沙漠表面，运用Herkelrath提出的土壤湿度与介电常数的通用式计算沙土的介电常数，选用FDTD数值计算方法分析高度起伏均方根、入射角度、目标长度、目标宽度、目标高度、横向沙丘的高度和横向沙丘迎风坡坡底到坡顶的水平距离的变化对散射系数的影响，得到横向沙丘表面与上方目标的复合电磁散射特性。分析了粗糙面为指数型分布和高斯型分布时散射系数的角分布曲线的不同之处。更多还原

【Abstract】 The exponential distribution and Gaussian distribution are used to represent the height fluctuation of the desert surface, respectively. The Monte Carlo method is used to simulate the horizontal sand dune surface and the flat desert surface between sand dunes. The dielectric constant of sand soil is calculated by the general formula of soil moisture and dielectric constant proposed by Herkelrath. The root mean square of height fluctuation and incident angle are analyzed by FDTD numerical calculation method. The effects of object length, object width, object height, the height of transverse dunes and the horizontal distance from the windward slope bottom to the slope top of transverse dunes on the scattering coefficient are obtained, and the composite electromagnetic scattering characteristics of the surface of transverse dunes and the object above are obtained. The differences of angular distribution curves of scattering coefficients when the rough surface is in exponential distribution and Gaussian distribution are analyzed.更多还原