Design Of Wireless Sensor Networks Localization Algorithm Based Mobile Beacon Node

This paper presented a localization algorithm, which is based on the mobile beacon node and called FBNTCSEKF(four beacon nodes trilateral centroid sequential extended kalman filter)algorithm,the algorithm is designed for the mobile beacon nodes situation in the wireless sensor network.This paper accomplished the algorithm on the actual system, and did the relevant research on localization algorithm and filter algorithm.Paper first introduced the hardware and software platforms, then we put forward the positioning system design of the overall solution in this paper. This paper selected the log-distance distribution of the wireless signal transmission, measured the distance through the node’s received signal strength indicator (RSSI) on the hardware platform,.After that, we used the least square method to carry on the preliminary correction.The paper put forward FBNTC(four beacon nodes trilateral centroid algorithm) to locate, The algorithm improved the original trilateral positioning method, and it is based on the distance between unknown node and beacon node and the beacon node’s coordinates.In this paper, on the basis of the basic localization algorithm implementation, we designed FBNTCSEKF localization algorithm, which is based on the combination of the mobile beacon node.The combination algorithm used SEKF(sequential extended kalman filter) to the unknown node coordinate calculation after initial alignment, in order to reduce occurring in the process of positioning error. Paper presented a SEKF algorithm of system state equation and observation equation, and expounded the time to update and update the related process of measurement.Paper first confirm the log-distance distribution’s parameters through the experiment.It tested the location of different distances, used the least squares method to draw the relationship between the measuring distance and the actual distance.This paper also proved the basic trilateral localization algorithm and trilateral centroid localization based on four beacon nodes method, compared the two methods of locating the positioning accuracy of the results.This article also tested the localization algorithm FBNTCSEKF based on the combination of the mobile beacon node, compared the positioning the accuracy of the results on the difference between before and after filtered.Results show that the design of the combination of localization FBNTC algorithm can meet the requirements of mobile beacon nodes localization, and algorithm is effective.