Personnel precise positioning system of coal mine underground based on UWB

For short positioning distance, low positioning accuracy and location data jumping of personnel positioning system of coal mine based on Bluetooth, WiFi, RFID, Zigbee and so on, a precise positioning system was proposed which is based on UWB technology. The principle of UWB positioning technology and symmetrical two-way two-way ranging (SDS-TWR) algorithm is analyzed and applied to the system. According to the characteristics of coal mine roadway, a single card reading substation can be used to independently network and realize one-dimensional accurate positioning of positioning card. The experimental results show that the UWB technology meets the positioning requirements of the system, the algorithm is flexible, the refresh rate is fast, the positioning error is not more than 0.3m, and the coverage reaches 400m. (paper)