Research On Node Localization Error Control Technology In Wireless Sensor Network

As the general use of internet of things,big data and the of artificial intelligence technology,it is more and more important to obtain the location information of the nodes through the wireless sensor network,understanding the geographic location information of the data location accurately is of great significance to acquire the data for further analysis and research.There are numerous nodes of wireless sensors and the locations of the nodes are dispersed,which have essential theoretical value and application significance to further reduce the localization error of the nodes.DV-HOP localization algorithm is a relatively common and widely used algorithm in the algorithms of node localization.This paper has carried out an in-depth study on the larger error existed in the average hop distance of unknown nodes in DV-HOP algorithm,corrected the average hop distance in the original algorithm by introducing beacon node localization error in this algorithm,and then introduced RSSI parameters to conduct the weighted calculation for the estimated value of each beacon node,an improved error control algorithm based on RSSI.It is validated by the simulation experiment that the localization accuracy of the algorithm after improvement increases 6.45%?9.53%.For the problem that the error still exists in the coordinate of the node after using the localization algorithm once,an error control method based on robust estimation is put forward.This method takes into account the localization error of neighbor nodes and the influence of link quality between nodes on modifying the node coordinates,designs the weight factors by comparing the estimated distance and measurement scale between the nodes and the sequence similarity of hop number of neighbor nodes,designs the piecewise objective function,when calculating the coordinates of the nodes,the measured value and estimated value with small errors are given corresponding weights,however,the location value with large error inhibits its effect in the calculation of node coordinates.It is discovered that though the experiment the communication radius of the node has a great influence on this algorithm,and the localization accuracy is improved by more than 10% compared with the traditional algorithms.Under the conditions of different beacon node ratio,different node communication radius and different signal propagation model,this paper conducts the experimental simulation comparison for the algorithm.The result shows that the localization accuracy of the algorithm studied in this paper has certain improvement and the robustness of the algorithm is further enhanced.