复杂城市环境三维高斯波束跟踪预测模型  

A new 3D Gaussian beams launching and predicting model in complex metropolis environment

作　　者：唐亚平[1] 徐大专[1] 朱秋明[1] 任佳敏[1] 鲍军委[2] 

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京210016 [2]南京航空航天大学理学院,江苏南京210016

出　　处：《电波科学学报》2014年第1期86-91,121,共7页Chinese Journal of Radio Science

基　　金：航空基金(20120152001);中央高校基本科研业务费专项资金资助(NZ2012012);中国博士后科学基金(2013M541661);南京航空航天大学研究生学位论文创新与创优基金(DZS201103);研究生创新基地(实验室)开放基金(kfjj130115)

摘　　要：针对现有高斯波束跟踪预测方法认为绕射效应由波束扩展叠加体现而忽略绕射波束的问题,提出一种基于三维高斯波束的复杂城市环境电波传播损耗预测模型,该模型通过几何光学和几何绕射理论实现绕射波束的跟踪,并应用复射线理论和启发式有限导电率介质劈一致性绕射系数公式实现绕射场强计算.文中还分析了传播距离、反射次数等因素对电波传播预测精度和复杂度的影响.数值仿真结果表明：渥太华城市传播环境下考虑绕射预测精度比传统高斯波束跟踪模型高0.02-2.2dB,计算效率下降8%-10%;由于反射损耗、传播距离及波束扩展等因素,预测精度在反射次数取12时较高.The traditional Gaussian beam tracing and predicting model doesn＇t take a special treatment of diffraction effects,which are accounted for by superposition of transformed beam fields.A new 3D Gaussian beam-tracing and predicting model in complex metropolis environment is proposed.The beam tracing algorithm is based on geometrical optics and the uniform geometrical theory of diffraction.Diffraction effects are evaluated by using complex ray formulas and a new heuristic uniform diffraction coefficient for nonperfectly conducting wedges.The effects of propagation distance and order of reflection on predicting precision and complexity are also analyzed.The simulation results show that the precision of our new method is 0.02 to 2.2dB higher than old Gaussian beam-tracing method and meanwhile the calculation efficiency is decreased by 7.5 to 10 percent in Ottawa.And it is found that 12 is a good value for the order of reflection considering reflection loss and beam transverse extension.

关 键 词：复射线 三维高斯波束 电波传播 绕射 反射次数 

分 类 号：TN011.91[电子电信—物理电子学]