摘要
选用指数型分布表示由面层、基层、路基层构成的沥青混凝土路面的高度起伏状况,采用蒙特卡罗方法模拟沥青混凝土路面,选取土壤四成分模型表示路基层介电常数,运用时域有限差分(FDTD)方法研究了沥青混凝土路面的电磁散射特性;数值计算得到了散射系数的角分布曲线,讨论了路面高度起伏均方根,相关长度,面层、基层厚度,路基层湿度以及入射波频率对散射系数的影响。结果表明,高度起伏均方根和入射波频率对散射系数的影响较大,面层厚度和相关长度对散射系数的影响较小且较为复杂,基层厚度和路基层湿度对散射系数几乎没有影响。
The exponential distribution is selected to represent the height fluctuations of asphalt concrete pavement composed of surface,base and subgrade.Monte Carlo method is used to simulate asphalt concrete pavement.Soil four-component model is selected to express the dielectric constant of the subgrade,and FDTD method is used to study the electromagnetic scattering characteristics of asphalt concrete pavement;The angular distribution curve of the scattering coefficient is obtained by numerical calculation,and the effects of the pavement height fluctuation root mean square,relative length,surface layer,base layer thickness,road base humidity and incident wave frequency on the scattering coefficient are discussed;The results show that the height fluctuation root mean square and the fre⁃quency of the incident wave have a great influence on the scattering coefficient.The thickness and correlation length of the surface layer have little and complex effect on the scattering coefficient.The thickness of the base layer and the humidity of the subgrade have almost no effect on the scattering coefficient.
作者
董子宇
任新成
赵晔
杨鹏举
朱小敏
DONG Zi-yu;REN Xin-cheng;ZHAO YE;YANG Peng-ju;ZHU Xiao-min(School of Physics and Electronic Information,Yan′an University,Yan′an 716000,China)
出处
《延安大学学报（自然科学版）》
2021年第2期104-109,共6页
Journal of Yan'an University：Natural Science Edition
基金
国家自然科学基金项目(61861043,61701428,61801416)
复旦大学电磁波信息科学教育部重点实验室开放基金项目(EMW201910)。
关键词
电磁散射
沥青混凝土路面
FDTD
四成分模型
electromagnetic scattering
asphalt concrete pavement
FDTD
four-component model
