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Modeling of the Division Point of Different Propagation Mechanisms in the Near-Region Within Arched Tunnels

机译：拱形隧道内近区域不同传播机制的分界点建模

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An accurate characterization of the near-region propagation of radio waves inside tunnels is of practical importance for the design and planning of advanced communication systems. However, there has been no consensus yet on the propagation mechanism in this region. Some authors claim that the propagation mechanism follows the free space model, others intend to interpret it by the multi-mode waveguide model. This paper clarifies the situation in the near-region of arched tunnels by analytical modeling of the division point between the two propagation mechanisms. The procedure is based on the combination of the propagation theory and the three-dimensional solid geometry. Three groups of measurements are employed to verify the model in different tunnels at different frequencies. Furthermore, simplified models for the division point in five specific application situations are derived to facilitate the use of the model. The results in this paper could help to deepen the insight into the propagation mechanism within tunnel environments.
机译：隧道内无线电波近区域传播的准确表征对于高级通信系统的设计和规划具有实际意义。但是，关于该区域的传播机制尚未达成共识。一些作者声称传播机制遵循自由空间模型，另一些作者则打算通过多模波导模型对其进行解释。本文通过对两种传播机制之间的分界点进行解析建模，澄清了拱形隧道附近区域的情况。该过程是基于传播理论和三维实体几何学的结合。采用三组测量值以不同频率在不同隧道中验证模型。此外，导出了在五个特定应用情况下的分割点简化模型，以利于模型的使用。本文的结果可能有助于加深对隧道环境内传播机制的了解。

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