中文摘要：

采用一维指数型粗糙面模拟沙漠表面,利用土壤介电常数的四成分模型计算沙土的介电常数,运用FDTD方法研究了沙漠表面的电磁散射特性,数值计算得出了沙漠表面电磁散射系数随散射角和入射波波长变化的曲线,讨论了电磁散射系数随沙漠表面高度起伏均方根、相关长度、入射电磁波波长的变化关系,数值计算结果表明,沙漠表面高度起伏均方根、相关长度、入射电磁波波长对沙漠表面电磁散射系数的影响比较复杂.

英文摘要：

The desert surface is simulated using the one dimensional exponential type distribution rough surface model,the dielectric constant of the sandy soil is calculated by the four-component model of dielectric constant of soil,the electromagnetic scattering properties of the desert surface is studied using the FDTD,the curves of the electromagnetic scattering coefficient from the desert surface with the scattering angle and the wavelength of the incident wave is obtained by numerical calculation,the varying relationship of the electromagnetic scattering coefficient from the desert surface with the root mean square,the correlation length of the desert surface and the wavelength of the incident wave is discussed.The numerical results show that the influence of the root mean square,the correlation length of the desert surface and the wavelength of the incident wave on the electromagnetic scattering coefficient from the desert surface is very complex.