Experimentally assessed underground mines propagation model at high UHF frequencies

This paper shows that a ray-tracing model focused on reflected rays can be used for power prediction in an underground area. The model is calibrated and then validated in scenarios where the received power prediction efficiency is confirmed by experimental measurements recorded along three distinct routes in the same gallery with the transmitting antenna located at three different locations. Different positions of the transmitting antenna and their effects on the model are analysed and the efficiency of the model is shown using three indices such as mean error, standard deviation error or root mean squared error comparison. Some electromagnetic inputs parameters of the model are definitively analysed and their value are proposed to characterize propagation in the gallery area at 2.4 GHz.