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

Abstract

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.

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Correspondence to Ke Guan.

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Guan, K., Zhong, Z., Ai, B. et al. Modeling of the Division Point of Different Propagation Mechanisms in the Near-Region Within Arched Tunnels. Wireless Pers Commun 68, 489–505 (2013). https://doi.org/10.1007/s11277-011-0464-7

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Keywords

  • Break point
  • Division point
  • Modeling
  • Near-region
  • Propagation
  • Tunnel