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Deployment of wireless sensor networks and wireless communication systems have become indispensable for better real-time data acquisition from ground monitoring devices, gas sensors, and equipment used in underground mines as well as in locating the miners, since conventional methods like use of wireline communication are rendered ineffective in the event of mine hazards such as roof-falls, fire hazard etc. Before implementation of any wireless system, the variable path loss indices for different work place should be determined; this helps in better signal reception and sensor-node localisation. This also improves the method by which miner carrying the wireless device is tracked. This paper proposes a novel method for parameter determination of a suitable radio propagation model with the help of results of a practical experiment carried out in an underground coal mine of Southern India. The path loss indices along with other essential parameters for accurate localisation have been determined using XBee module and ZigBee protocol at 2.4 GHz frequency.

Radio frequency propagation model and fading of wireless signal at 2.4 GHz in an underground coal mine