%0 Journal Article %T Positioning a Node of Wireless Sensor Networks in 3 Dimensional Space %A Wenhui NIE %A Shiguang JU %A Anrong XUE %A Feng LI %J Int'l J. of Communications, Network and System Sciences %P 540-545 %@ 1913-3723 %D 2009 %I Scientific Research Publishing %R 10.4236/ijcns.2009.26059 %X To know the location of nodes is very important and valuable for wireless sensor networks (WSN), we present an improved positioning model (3D-PMWSN) to locate the nodes in WSN. In this model, grid in space is presented. When one tag is detected by a certain reader whose position is known, the tagĄ¯s position can be known through certain algorithm. The error estimation is given. Emulation shows that the positioning speed is relatively fast and positioning precision is relatively high. %K Wireless Sensor Network %K Cells %K Reader %K Tag %K Positioning %U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=697