Localization and time synchronization of sensor network for infrastructure monitoring
This paper presents a hierarchical sensor network system for robust localization and time synchronization.This system consists of parent nodes with a low priced L1 GPS receiver and child nodes equipped with an acoustic ranging device.Relative positions between child nodes are estimated based on acoustic ranging through the inverse Delaunay algorithm.This algorithm localizes all the nodes simultaneously,thus,the accumulation of the error in the localization is suppressed.Relatively localized child sensor nodes are given global coordinates with the help of GPS on parent nodes.The parent node consists of a low priced L1 GPS receiver and wireless LAN.Noise tolerant acoustic ranging algorithm that employs digital signal processing techniques is implemented in the child node.Experiments show that this ranging algorithm gives average range estimation error below 10 cm.In addition to the capability of localization,ability for time synchronization is implemented.This system consists of three types of nodes,i.e.,i)a time node which broadcasts time stamp,ii)sensing nodes which get data from on-board sensors and iii)a sink node.Every data from sensor node is synchronized by using broadcasted time stamps as reference.
Localization Time Synchronization Acoustic Ranging Hierarchical Sensor Network
Kenji Oguni
Earthquake Research Institute,The University of Tokyo,Yayoi 1-1-1,Bunkyo,Tokyo 113-0032,Japan
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）