无线传感器网络质心定位算法研究  

Research onCentroid Localization Algorithm for Wireless Sensor Networksbased RSSI

作　　者：何艳丽[1] 

机构地区：[1]中州大学,河南郑州450044

出　　处：《计算机仿真》2011年第5期163-166,219,共5页Computer Simulation

摘　　要：节点定位是无线传感器网络中的关键技术之一。质心定位算法完全依赖于锚节点的密度大小及分布情况,锚节点的密度较小且随机分布,所以质心定位算法的定位精度比较低。为了提高节点定位的精度,提出了一种改进的无线传感器网络质心定位算法。在质心定位算法中引入接收信号强度(RSSI)信息,利用RSSI计算节点间点到点的信号强度,并把信息强度值转换成距离值,取倒数作为质心算法权重值,通过质心定位算法对未知节点坐标进行计算,得到节点的具体位置。通过仿真对算法进行测试与分析,仿真结果表明,算法定位的误差减小,提高了节点定位精度,是一种有效的定位算法,为网络设计提供了依据。Localization of nodes is the key technology for application of wireless sensor network.The positioning accuracy of centroid localization algorithm completely depends on the size and the distribution density of anchor nodes.Anchor nodes are small and the density of anchor nodes is distributed randomly in actual application,so the positioning accuracy of centroid localization algorithm is relatively low.In order to improve the accuracy of nodes,a method is proposed based on received signal strength indicator and wireless sensor network centroid localization algorithm.In the algorithm,firstly,point-to-point signal intensity is computed by RSSI and converts its inverse distance as the centroid algorithm.Then the weights of centroid localization algorithm are used for calculating coordinates of the unknown node.Through the simulation algorithm for testing and analysis,the simulation results show that,compared with the traditional algorithm,the positioning error of the centroid localization algorithm is obviously reduced and the node location accuracy is improved.It is an effective localization algorithm for application of wireless sensor networks.

关 键 词：无线传感器网络 节点定位 接收信号强度指示 质心定位算法 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]