基于改进分步傅里叶算法的弯曲隧道电磁建模及仿真方法  

Electromagnetic Modeling and Simulation Algorithm of Crooked Tunnels Based on Improved Split-Step Fourier Transform

作　　者：熊洁[1] 段永奇[1] 虞凯[1] 钟选明[2] XIONG Jie;DUAN Yong-qi;YU Kai;ZHONG Xuan-ming(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Electromagnetics Institute Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,四川成都610031 [2]西南交通大学电磁场与微波技术研究所,四川成都610031

出　　处：《真空电子技术》2020年第6期52-56,共5页Vacuum Electronics

基　　金：国家自然科学基金项目(61771407);铁二院横向项目(2018H00665)。

摘　　要：针对现有弯曲长隧道电磁建模粗糙、仿真计算效率不高的问题,论文提出了基于改进分步傅里叶算法的弯曲隧道电磁建模及仿真计算新方法。该方法通过将隧道壁衰减系数引入传统的分步傅里叶计算公式,模拟隧道壁对电磁波的散射与吸收;通过修正空间域内的相位,来表征弯曲隧道内电磁波传播过程中产生的波阵面扭转效应。仿真结果表明,新方法能高效、准确地计算出隧道内的电场分布,相较于传统的交替方向隐式有限差分方法,计算效率提高了37倍。新方法特别适用于宽、长隧道的电磁波覆盖预测和分析,为隧道环境中移动通信系统的设计与优化,提供强有力的仿真计算工具。Aiming at the rough modeling and low calculation efficiency of existing models of long crooked tunnels,a new method of electromagnetic modeling and simulation for crooked tunnels based on improved Split-step Fourier Transform is proposed.The method simulates the scattering and absorption of electromagnetic wave by introducing the attenuation coefficient of tunnel wall into the traditional algorithm,and represents the torsion effect of wave front during the propagation of electromagnetic wave in crooked tunnel by modifying the phase in space domain.The simulation results show that the new method can calculate the electric field distribution in tunnels efficiently and accurately.Compared with the traditional Alternating Direction Implicit method,the new method has 37 times higher computational efficiency.It is especially suitable for the prediction and analysis of electromagnetic wave coverage in wide and long tunnels,which makes it a powerful simulation tool for the design and optimization of mobile communication system in tunnel environment.

关 键 词：分步傅里叶算法 电磁建模 仿真计算 隧道 

分 类 号：TN828.6[电子电信—信息与通信工程]