Research On Relocation Method Of Drift Node In Coal Mine

The safety risk of coal mining is very high.The real-time circumstances of the coal mine underground need to have a comprehensive comprehending to guarantee the safe and efficient work in the coal mines.Therefore,the precise positioning of the target is inevitable and is an important guarantee for coal mine safety.However,the environment in a coal mine is very special and very harsh.Usually,a large number of sensor nodes are placed anywhere in the coal mine,workers and equipment.So that real-time monitoring of the current status of the coal mine underground and working condition of production equipment and sending information to miners and other workers through sensor nodes by collecting information are feasible.At the same time,these arranged sensor nodes not only can perceive things of the surrounding environmental and collect information,but also can establish a wireless sensor network system through the mutual communication between the sensor nodes and other equipment in the coal mine underground,so that the auxiliary work of accurately positioning the positions of other nodes in the underground can be performed.Due to the underground environment of coal mines is complex,and mining is prone to dangerous accidents.After an accident occurs,the initial setting position of the wireless sensor network nodes arranged in the monitoring area may change,so it is necessary to reconstruct the available wireless sensor network in order to carry out further work of positioning and communication.In this paper,how to reconstruct the wireless sensor network through the mutual communication and information collection between the nodes in the wireless sensor network monitoring area,affected by the environment or accidents,and drifting after the nodes drift,the main work includes the following aspects:A weighted DS evidence theory positioning algorithm is proposed.By collecting the surrounding environment information of the sensor nodes that can still work in the area and the mutual communication between the sensor nodes,the credibility of each node without drift after the accident is calculated.Select high-reliability nodes as beacon nodes for relocation to reconstruct the wireless sensor network in the monitoring area,and provide information support for further rescue work.The simulation results show that this method improves the positioning accuracy compared with the existing drift node relocation method of related credibility calculation.At the same time,when there are mobile nodes in the monitoring environment,on the basis of the planned beacon moving path and the previously proposedpositioning algorithm,a moving path planning method based on weighted DS evidence theory is proposed.By mobilizing the moving path of the movable node,the position coordinates of the relocation beacon nodes selected by the weighted DS evidence theory are corrected.The simulation results show that the method is not only superior to the classic DOUBLE-SCAN path and S-shaped path in terms of moving path length and positioning accuracy.The positioning algorithm are also superior to the previously proposed weighted DS evidence positioning algorithm,which reduces the positioning error.The thesis contains 45 figures,3 tables,and 89 references.