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

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.