Research On Location Method Of Mobile Node In Mine Laneway Wireless Sensor Network

Underground roadway criss-cross,there is much serious interference in propagating of electromagnetic waves,which result in hard to accurate position of the target in mine.The precise positioning of the wireless sensor nodes in the mine is one of the key problems,especially which is an important basis for emergency rescue and accident handling when the roadway is in disaster.At present,the localization algorithm of wireless sensor nodes has many problems,including positioning accuracy low,high error,susceptible to environmental interference and positioning target movement,which becomes the bottleneck of high precision positioning of underground targets.Therefore,to improve positioning accuracy of wireless sensor network nodes is of great significance to mine operation safety guarantee.For the location of fixed nodes,this paper analyzes how the geometric position relation between anchor nodes affects the positioning accuracy of being based on RSSI node localization algorithm.Based on combine the spatial model and the node distribution model of underground tunnel and selecting the frequency of wireless communication suitable for downhole communicateon,this paper proposes an RSSI fixed node location algorithm based on filter anchor node mechanism by Gaussian elimination method.The fixed node localization algorithm effectively avoids the position error caused by the position,distance relation and estimation error of the anchor nodes when the unknown node position is estimated by the least squares method.The experimental results show that the positioning accuracy of this algorithm is greatly improved.For the location of mobile nodes,this paper analyzes the effects of the width of the downhole lane,the offset angle of the moving node,the offset angle prediction error and the least squares degradation state on the positioning accuracy of the adaptive mobile node localization algorithm.The According to the moving direction of the mobile node obtained by the historical node,the moving node algorithm based on angle adaptive is proposed.The algorithm is based on the angle self adjustment method and the anchor node screening mechanism.Improve the positioning accuracy of mobile nodes.The experimental results show that the proposed algorithm improves the positioning accuracy compared with the adaptive mobile node localization algorithm,reduces the error rate,and the algorithm locates the error range to reach the meter level,which is suitable for downhole positioning of the wireless sensor network node.