摘要
针对狭长空间环境下信号传播的多径效应等原因导致节点定位的精度不足问题,提出一种改进的WSN(无线传感器网络)节点质心定位算法。首先,给出狭长空间环境下锚节点部署策略,采用shadowing模型将锚节点接收到的信号强度值转换为距离值,使得未知节点的位置初步定位在最近的三个锚节点构成的三角形内;然后,以这三个锚节点的圆心距离值为半径形成三个圆,根据得到的有效交点个数,分四种情况得到未知节点的位置估计。仿真结果表明,改进质心算法平均定位误差在1 m左右,在定位区域不同位置仍能保持稳定的定位性能,与极大似然估计法和质心算法相比,该算法定位精度与稳定性都得到提高。
This paper proposes an improved node centroid localization algorithm based on WSN as a solution to insufficient accuracy of sensor node positioning due to signal multipath effect result in narrow space. The study consists of providing a strategy of node deployment in narrow space,converting received signal strength value of anchor node to distance value,and leaving the unknown node primarily mapped in a triangle consisting of the nearest three anchor node; and then taking the three anchor node as the center and a radius of distance value to form three circles and dividing the position estimation of unknown nodes into four cases based on the number of effective cross points. Simulation results show that the improved algorithm working with a positioning error of around 1 m,boasts a higher positioning accuracy and stability than the maximum likelihood estimation method and the centroid algorithm.
作者
赵志信
李加君
江晓林
谢玉鹏
Zhao Zhixin Li Jiajun Jiang Xiaolin Xie Yupeng(School of Electronics ＆ Information Engineering, Heilongjiang University of Science ＆ Technology, Harbin 150022, China)
出处
《黑龙江科技大学学报》
CAS
2016年第5期577-580,共4页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省自然科学基金面上项目(F2015019
F2015017)
关键词
多径效应
锚节点
定位
狭长环境
质心算法
multipath effect
anchor node
positioning
narrow space
centroid algorithm
作者简介
赵志信（1979-），男，黑龙江省依兰人，副教授，博士，研究方向：无线网络资源管理，E-mail：zhaozhixin0830@163．com。
