矿井巷道ZigBee无线传输特性研究

Reseach of Wireless Transmission Characteristics of ZigBee in Mine Tunnel

在地下平直巷道内模拟井下环境,对矿井ZigBee无线传输特性进行了实验研究。首先选用路径损耗系数模型作为矿井巷道无线传输模型,然后采用两个GAINZ节点分别测试了不同距离下接收信号强度指示的波动性及其受障碍物的影响特性、节点间距不同时的收包率、节点间距不同时的接收信号强度指示值。由测试结果分析得,在平直巷道内,所选取的路径损耗系数模型是可行、准确的,即可用接收信号强度指示来进行测距及定位;平直巷道内的节点间距为30~40 m时,通信是可靠的;路径损耗系数模型在实际矿井巷道内应用时需重新设置参数。

Wireless transmission characteristics of ZigBee were tested and researched in simulated mine environment by use of underground straight tunnel.Firstly,path loss coefficient model was taken as wireless transmission model of mine tunnel,then some communication indexes were tested by use of two GAINZ nodes including wave of received signal strength indication and influence on received signal strength indication by obstacle at places with different distances away from sending node and packet reception rate and received signal strength indication under the condition of different distances between the nodes.The analysis conclusions of testing results are as following： in straight tunnels,the path loss coefficient model is feasible and correct for distance measurement and location by use of received signal strength indication;when distance between two nodes is from 30 m to 40 m in straight tunnels,ZigBee wireless transmission is reliable;parameters of the path loss coefficient model needs setting according to the environment in application of actual mine tunnels.