Abstract: There are existing some shortcomings in accurate positioning system applying to coal mine, such as the near cover distance, difficult miniaturization and high cost. Focus on the above shortcomings, a accurate positioning node is designed based on ZigBee. The accurate positioning nodes design divide into two categories: the center node design and the target node design. And they both utilize the same radio frequency chip-JN5168. Meanwhile, center node and target node use different antennas because of different miniaturization needs. After testing in testing coal mine tunnel, applying the designed node to the accurate positioning system can improve the performance of the positioning system, its coverage distance can reach up to 300 meters and its positioning accuracy can reach less than 10 meters.

Key words: ZigBee, Accurate Positioning, Center node, Target node, Coal mine