基于RSSI多边定位误差的加权质心定位算法  

Weighted centroid localization algorithm based on multilateral localization error of received signal strength indicator

作　　者：崔法毅[1] 邵冠兰 

机构地区：[1]燕山大学河北省测试计量技术及仪器重点实验室,河北秦皇岛066004

出　　处：《红外与激光工程》2015年第7期2162-2168,共7页Infrared and Laser Engineering

基　　金：秦皇岛市科学技术研究与发展计划(2012021A004)

摘　　要：为了优化无线传感器网络（Wireless Sensor Networks,WSN）中的定位算法,提高节点定位精度,提出一种基于多边定位误差的加权质心算法。分析了无线电的路径损耗模型,建立基于信号接收强度（Received Signal Strength Indicator,RSSI）和距离关系的对数拟合测距公式,给出了求解未知节点坐标的多边定位法和位置估算模型。多组数据定位后,以定位误差值的倒数作为权值,改进传统的质心算法,并讨论了参考点个数的选取与误差的关系。实验表明：改进后的加权质心比传统质心定位精度进一步提高,选择4~5个参考节点具有良好的定位效果。In order to optimize the localization algorithm and improve the accuracy of positioning in Wireless Sensor Network（WSN）, a kind of weighted centroid localization algorithm based on multilateral localization error was proposed. After analyzing the transmission model of wireless signal, a model of distance measurement was established on account of logarithm fit about the relationship between Received Signal Strength Indicator（RSSI） and distance. Then the multilateral localization algorithm and location estimation model of solving unknown node′s coordinates were introduced. After the orientation of several sets of data, the reciprocal of positioning error was used as a weight in the process of calculation to improve usual centroid algorithm and the influence of selection of reference point number to the error was discussed. The experimental result shows that when compared with traditional centroid algorithm, the improved weighted centroid algorithm has better localization precision, when choosing four or five reference nodes, the experiment can achieve better location performance.

关 键 词：无线传感器网络 节点定位 加权质心算法 接收信号强度 多边定位误差 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]