Research On Mine Underground Personnel Positioning Alogorithm

Because of the mine’s environment complex，especially when the accident happens，the minestaff cann’t find out the accurate position situation about personnel rapidly，this brings enormaouseconomic losses to both the enterprises and the society，therefore，It is urgent to implement fast detectingand real-time tracking of the mine personnel in coal pit．and It is also an important measure to reduceaccidents．In recent years，with the continued development of wireless sensor network，and its techniquebecomes increasingly sophidticated．it is widely used in growing number of fields，applying it to thetracking of the mine personnel is also the trend of the Times．First of all，the state-of-the-art of the localization related technology is discussed．and theperformance comparison among the existing technology is given．then this research enabled us to confirmthe wireless sensor networks is used as the method of localization sutable for coal mine．The focus is on themain research points of the zigbee positioning technology which is suitable for the undergroundcommunication technology．Secondly， several common near field communication(NFC)techniques are introduced andexplained in detail． Some merits and demerits of these methods were analyzed and compared．It isconcluded that zigbee technology is the most efficient way of working．and the diagram of the positioningsystem based on zigbee technology is developed，the principle that the system works on and the way to setup is discussed．Then to those several commonly coal mine personnel positioning algorithms，makes the analysisand synthesis，the miner regional position algorithms based on zigbee technology is proposed．Because ofthe atrocious environment of mine underground，the fading and multiplex effect to signals in thetransmitting process，warrant the value RSSI was once seriously deviated from its actual value．Based onthe case，this paper proposed the beacon node which is nearest to the unknown node acts as a blind node，the measure distance between the beacon node and the remaining two beacon node is computed by the received signal strength，which is compared with the real distance，the everage position error of the beaconnode can be got，which is used to compensate the unkown node which is nearest to the beacon node．thesimulation results show that the method can obviously increase accuracy of distance estimation andenhance location precision．In the end，the positioning algorithms is further discussed under the beacon node which was usedto participate in positioning is less than3．The coordinate transformation method is proposed to use forpositioning．Firstly，the measurement error weight is calculated according to the accurate position betweenbeacon nodes in the region of the positioning，which is used to revised the unknown nodes in order to getthe more accurate distance；Then the accurate location information between beacon nodes and the reviseddistance which is measured by unknown nodes are to be good use．Through the coordinate translation，rotation and other conversions，the localization of the unknown nodes is achieved Finally．Manysimulations result that this algorithm has the advantage of localization precision under the beacon nodesunderdetermined circumstances，making up for using the least three beacon nodes to achieve thelocalization．...