基于一个移动锚节点的无线传感器网络节点定位算法  

Localization in Wireless Sensor Networks with Mobile Beacon Node

作　　者：胡炜薇[1] 胡冀[1] 应智花[1] 

机构地区：[1]杭州电子科技大学电子信息学院,杭州310018

出　　处：《系统仿真学报》2010年第4期978-982,共5页Journal of System Simulation

基　　金：浙江省自然科学基金(Y1080589;Y1090765)

摘　　要：节点定位技术是无线传感器网络应用的重要支撑技术之一,对此提出了一种基于移动锚节点的两步定位算法。该算法利用一个移动锚节点遍历整个网络,并周期性的广播包含自身当前位置的信息。把传感器节点的自身定位过程用基于无迹状态滤波(UKF)的目标跟踪方法实现。由于所用的目标状态模型和量测模型有一定的不确定性,所以先选取不共线3个锚节点信息,利用三边定位法提高滤波的初始位置精度,从而改善定位效果。最后仿真并分析比较了锚节点在多种移动轨迹情况下节点定位误差,结果表明本文所述两步定位法改善了对锚节点移动轨迹的特殊要求的限制,更适合实际情况,并取得理想的定位精度。The node localization technology is a key support to wireless sensor networks application technology,and a two-step node localization algorithm was proposed based on a mobile beacon node. In this way,each sensor calculated their locations via an Unscented Kalman Filter （UKF）-based algorithm,just likes as in target tracking procession. Due to the uncertainty of the dynamic state and observation models,three non-collinear location information of beacon were selected to calculate the sensor node＇s coarse location using the trilateration,and the localization effect was advanced. Simulation compared the localization error of different algorithm,when the beacon moved along multiple different trajectories. The results show that two-step localization method does not have special requests for beacon trajectory,which is fit to be used in the actually environment,and obtain the ideal location accuracy.

关 键 词：无线传感器网络 定位 移动锚节点 无迹滤波 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]