沙漠表面电磁散射的矩量法研究

采用一维指数型分布粗糙面模型和Monte Carlo方法模拟实际的沙漠表面,利用土壤介电常数的四成分模型计算沙土的介电常数,运用矩量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频率的变化曲线,讨论了电磁散射系数随沙漠土壤湿度、沙漠表面高度起伏均方根、相关长度、入射波频率的变化关系,数值计算结果表明,沙土湿度、沙漠表面高度起伏均方根、相关长度、入射波频率对沙漠表面电磁散射系数的影响是比较复杂的.

Study on Electromagnetic Scattering from the Desert Surface Using the Method of Moment

The actual desert surface is simulated using the 1D exponential type distribution rough surface and Monte Carlo method. The dielectric constant of the sandy soil is calculated by the four-component model of dielectric constant of soil, and the electromagnetic scattering characteristics of the desert surface is studied using the MoM. The curves of the electromagnetic scattering coefficient from the desert surface with the scattering angle and the frequency of the incident wave are obtained by numerical calculation. The varying relationship of the electromagnetic scattering coefficient from the desert surface with the moistness of sandy soil, the mean square root, the correlation length of the desert surface and the frequency of the incident wave is discussed. The numerical results show that the influence of the moistness of sandy soil, the mean square root, the correlation length of the desert surface and the frequency of the incident wave on the electromagnetic scattering coefficient from the desert surface is very complex.