Abstract: In view of problem of high cost and big construction difficulty of existing accurate personnel positioning system which needs two base stations to complete direction recognition function, a kind of direction recognition technology based on single base station was introduced to the system. The single base station adopts two directional antennas to receive the same signal, and judges the direction of miners according to the difference of received signal strength from the two antennas. Applying the technology to direction recognition of underground staff can effectively reduce the cost and construction difficulty of the accurate personnel positioning system, and further help popularize the accurate personnel positioning system in more coal mines.