| The wireless sensor network node location technology is one of the important technologies of wireless sensor network.Node location information is not only the premise of monitoring event,but also it is the basic of the network topology from the self configuration,improving routing efficiency and reporting the information required to observers.Wireless sensor network nodes are randomly deployed,due to the impact of the external environment and their own factors,which makes how to maximize the node localization accuracy be a difficult problem in the field of wireless sensor network positioning.Therefore,the research of the wireless sensor network node location technology has important practical significance.This paper firstly studies the traditional DV-Hop positioning algorithm and analyzes the shortcomings of traditional DV-Hop positioning algorithm in positioning accuracy and coverage.Aiming at the problem that the traditional DV-Hop algorithm has a large location error,a DV-Hop positioning algorithm based on RSSI correction is proposed.The improved algorithm is to redefine the number of hops between nodes,and in the process of coordinate calculation,the constraint conditions are added to achieve the purpose of optimization.The improved algorithm is simulated by MATLAB,and the simulation results show that the improved algorithm can effectively improve the positioning accuracy.Aiming at the problem of low coverage of traditional DV-Hop localization algorithm,an improved anchor node localization algorithm is proposed,which upgrades unknown nodes to anchor nodes and participates in subsequent positioning calculation.In addition,the position of unknown nodes which is solved is corrected in the improved algorithm.The improved algorithm is simulated by MATLAB,and the effectiveness of the improved algorithm is verified.The simulation results show that the improved algorithm can improve the location coverage and improve the positioning accuracy under the same network connectivity. |
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