Abstract
Compared to rail/road tunnel the characteristics of electromagnetic (EM) wave propagation in underground mine tunnel is significantly different. For reliable operation of wireless communication system in underground mine environment; an understanding of radio signal behavior in such confined space is crucial. This paper discusses the experimental findings carried out in an operational underground mine and further proposed a modified multimode channel model for wireless communication networks in underground mine environments. The proposed channel model is validated with the experimental measurements carried out in both circular and rectangular coal mine tunnels. Based on the proposed channel model, we further analyzed the radio signal behavior considering antenna position and size of the tunnel. Our results are useful to understand the wireless signal propagation characteristics in underground mines, hence may be useful to design reliable and robust communication devices for such high-stress environments.
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