Research On Underwater Wireless Sensor Networks Localization Algorithm Based On Mobile Node

In recent years,underwater wireless sensor network(UWSN)node localization technology has attracted much attention,and it is widely used in marine environmental governance,natural disaster prevention and military defense.However,due to the particularity of the marine environment,most of the existing underwater node localization algorithms have low localization accuracy and poor localization effect.The localization error mainly comes from the movement of underwater nodes.Node movement will cause problems in the following three aspects: ranging error,node unable to communicate with enough beacon nodes,and beacon node offset.In view of the above problems,this paper mainly studies the localization of underwater wireless sensor networks based on mobile nodes,and proposes a Range Correction Based Localization Algorithm(RCL)and an Inertial Coordination Localization Algorithm(ICL)And a Mobility-constrained Beacon based Localization Algorithm(MCB).Among them,the RCL algorithm corrects the ranging error in the node localization operation to improve the localization accuracy.The ICL algorithm is applied when a node moves and deviates from the deployment area,resulting in a situation where it is unable to communicate with enough beacons within a certain time.The MCB algorithm includes a Mobility-constrained Beacon based Localization Algorithm in 2D(MCB-2D)and a Mobility-constrained Beacon based Localization Algorithm in 3D(MCB-3D).The MCB algorithm is based on the movement characteristics of mobile restricted beacon nodes,and combines the geometric relationship with neighbor nodes to locate unknown nodes.The entire localization process has nothing to do with the coordinates of the beacon node,which solves the problem that the localization accuracy of the node depends on the movement range of the beacon node.This paper uses MATLAB software to simulate the above algorithm.Simulation results show that the RCL algorithm proposed in this paper can correct the error of ranging error.ICL algorithm can track and locate nodes that deviate from the deployment area.MCB algorithm effectively solves the problem of beacon node offset affecting localization accuracy.These three algorithms reduce the impact of node movement,greatly improve the localization accuracy of the node,and can be well applied to UWSN mobile node localization.The simulation results show that the proposed RCL algorithm can correct the known localization algorithms.The ICL algorithm can track and locate nodes that deviate from the deployment area.The MCB algorithm effectively solves the problem that the beacon node offset affects the localization accuracy.These three algorithms have greatly improved the localization accuracy of the nodes,and can be well applied to UWSN mobile node localization.