A new accurate localization method in underground tunnel of coal mine

In view of problem of low accuracy of localization system based on electromagnetic wave in underground coal mine, an accurate localization method based on visible light communication in underground coal mine was proposed. The method uses visible light communication technology and adopts own situation information of LED light source to compute the distance between mobile terminal and specific LED light source according to received light signal intensity of mobile terminal, so as to locate by two-dimension positioning and three-dimension positioning. The positioning accuracy is a few centimeters with the method. The method overcomes multipath interference and improves localization quality compared with other localization method of electromagnetic wave.