摘要
研究了草地环境的电磁散射特性,以二维高斯粗糙面建立了草地环境分层结构。建立了鲜草和土壤的有效相对介电常数模型,绘出了鲜草、土壤有效相对介电常数随入射波频率的变化曲线,并总结了鲜草、土壤相对介电常数随入射波频率变化的规律。采用考虑了分层之间多次散射的微扰法(Small Perturbation Method,SPM)计算了鲜草含水量、土壤湿度、土壤层粗糙度及鲜草层粗糙度对草地环境后向电磁散射的影响。仿真结果表明,鲜草的含水量、土壤湿度、土壤层粗糙度及鲜草层粗糙度对草地的后向散射有不同程度规律性的影响。研究成果为草地粗糙度、地区的干旱程度以及是否有人畜活动痕迹的判断提供了理论参考。
The electromagnetic scattering characteristic of the grass environment is analyzed. The layered structure of soil and grass is founded by layered Gauss rough surface. The dielectric constant models of soil and grass are established, and the relationship of the dielectric constant with the frequency of incident wave is obtained. The effect on the grass environ- ment from moisture content of grass, moisture capacity of soil, roughness of the soil and grass layer is computed and re- searched using small perturbation method (SPM). The numerical results show that the influences of moisture content of grass, moisture capacity of soil, roughness of the soil and grass layer on the electromagnetic scattering are different but regular. The conclusion of this paper provides one kind of theoretical references for the estimate of the roughness, region' s drought extent and the movement track of mankind or animals.
出处
《微波学报》
CSCD
北大核心
2017年第6期90-96,共7页
Journal of Microwaves
基金
国家自然科学基金(61372033)
关键词
草表面
介电常数
分层粗糙表面
散射
grass surface, permittivity, layered rough surface, scattering