Research On Wireless Sensor Network Node Localization Algorithm In Straight Narrow Tunnel

Wireless sensor network (WSN) is a new network technology, plays an importantrole in underground personnel positioning and environmental monitoring.Fast and exactpositioning of underground personnel and harvesters are necessary means for mine safetyproduction, Due to the complex underground environment, positioning algorithm and thetraditional two-dimensional plane and three-dimensional plane node localization can notbe fully applicable to the underground. In this paper, according to the underground tunnelspace model and node distribution model,on the basis of analyzing the classicallocalization algorithm, the proposed simplified model of RSSI weighted centroidlocalization algorithm in straight narrow tunnel and RSSI weighted centroid localizationalgorithm of3d model instraight narrow tunnel.According to the type of situation underground tunnels, build tunnels simplifiedmodel,select one paragraph straight narrow tunnel do research and analysis, thedistribution of nodes in the tunnel in accordance with its function is divided into beaconnodes, monitoring node, unknown nodes, the nodes combined with underground tunnelsactual situation consider mobility and heterogeneous nodes, proposed simplified model ofRSSIweighted centroid localization algorithm in straight narrow tunnel, the algorithm willassign weights node communication radius of influence into account, correction theweights, Makes the modified algorithm on the error and computation compared with thetraditional algorithm, has certain improvement.For underground three-dimensional environment, Construct a three dimensionalmodel and three-dimensional coordinates of underground node, According to thedistribution of tunnel node model and signal propagation loss model in tunnel, proposedThe model of three dimensional space RSSI weighted centroid localization algorithm.Algorithm firstly to the unknown node do descending order set the received signalstrength，correction the distance value, Select RSSI values larger beacon nodes and set upthe tetrahedron model, Calculate the center of mass tetrahedron,The algorithm is suitablefor underground3d environment.Both algorithms for simulation analysis, the results showed that the higher accuracyof the algorithm, and scalable used in highway, railwaytunnel environment.