An Improved Precise Positioning Method for Intelligent Mine Construction

Abstract

Precise positioning plays an important role in the construction of intelligent coal mines. However, existing precise positioning methods often have problems with long positioning period, limited positioning capacity and low precision. To overcome these shortcomings, this paper proposes a time-division downlink time-difference-of-arrival (TD-D-TDOA) positioning method. In the proposed method, the base station first implements clock synchronization with the reference clock by direct or relay. Then the base station allocates the time for transmitting two positioning messages according to its serial number. Finally, the label uses these messages to obtain the TDOA and its location information. The proposed precise positioning method has the advantages of millisecond positioning cycle, self-position calculation, unlimited positioning capacity and high positioning accuracy. Moreover, the tag only needs to receive the location information broadcast by the base stations in the positioning process, which reduces the coupling degree between the tag and the location base station, as well as the cost of the tag hardware. Experimental results demonstrate that our method has a positioning accuracy of less than 20cm and a positioning frequency of up to 20 times per second, while also having high positioning stability.