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首页> 外文期刊>IEEE Vehicular Technology Magazine >Taking a Sharp Turn: Modeling of Diffraction Coupling in Radio Propagation Inside Tunnels
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Taking a Sharp Turn: Modeling of Diffraction Coupling in Radio Propagation Inside Tunnels

机译：急转弯：隧道内无线电传播中的衍射耦合建模

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摘要

The overall performance of a communication-based train control (CBTC) system largely depends on the performance of its data communications subsystem (DCS). The DCS network in almost all CBTC commercial system products marketed in the last decade uses radio communications in the open industrial, scientific, and medical (ISM) bands (2.4 or 5.8 GHz) to establish the bidirectional data link between central/wayside and onboard segments. Key factors in ensuring stable and sound radio communication are the number of wayside access points and locations of their antennas. Radio propagation modeling aims to provide optimal and reasonably reliable assurance of stable communication. However, the diffraction impact of sharp corners and edges in tunnels on the radio propagation process has been unaccounted for in the majority of models. The purpose of the present research is to incorporate the effect of diffraction coupling due to sharp edges in tunnel sections, including geometrical discontinuities such as cross junctions and L bends, through ray-mode conversion. The proposed modeling approach offers sufficient versatility to assimilate a variety of discontinuous geometries involving sharp edges in a tunnel environment. Numerical and empirical results suggest that the model provides an accurate tool for analyzing diffraction effects of tunnel discontinuities with sharp edges on the process of radio propagation.
机译：基于通信的火车控制（CBTC）系统的总体性能很大程度上取决于其数据通信子系统（DCS）的性能。过去十年中销售的几乎所有CBTC商业系统产品中的DCS网络都使用开放的工业，科学和医学（ISM）频带（2.4或5.8 GHz）中的无线电通信来建立中央/路边和机载段之间的双向数据链路。 。确保稳定可靠的无线电通信的关键因素是路边接入点的数量及其天线的位置。无线电传播建模旨在提供稳定通信的最佳且合理可靠的保证。然而，在大多数模型中，隧道中的尖角和边缘对无线电传播过程的衍射影响尚未得到解释。本研究的目的是通过射线模式转换，归因于隧道截面中的尖锐边缘所引起的衍射耦合效应，包括诸如交叉结和L形弯曲之类的几何不连续性。所提出的建模方法提供了足够的通用性，可以吸收隧道环境中涉及锐利边缘的各种不连续几何形状。数值和经验结果表明，该模型为分析具有尖锐边缘的隧道不连续性对无线电传播过程的衍射效应提供了准确的工具。

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