Inbuilding localization system based on wireless sensor networks
HUAN Ruohong, LI Yidong, HE Xiaohui, CHEN Qingzhang
(College of Computer Science and Technology, Zhejiang University of Technology, Hangzhou 310023, China)
Abstract: As the existing inbuilding localization systems have problems of inaccuracy and high cost, a location method based on wireless sensor network was investigated. After the analysis of existing localization system including RADAR, Active Badge and Cricket, an inbuilding localization system based on wireless sensor network(WSN) was established. The whole system was constituted by sink node, reference nodes and target nodes using GAINSJ wireless sensor nodes. The sink node was responsible for communication between PC and sensor nodes. Reference nodes were a group of sensor nodes that their positions are already known. The target nodes were the nodes to be positioned. A multilateral localization algorithm based on distance and maximum likelihood estimation method was used for calculating the coordinates of target nodes in the system. The localization results was analyzed and calculated. The reasons that affect system accuracy and efficiency have also been analyzed with the suggestions for the system performance improvement. The research results show that the inbuilding localization system can locate in an ideal environment with localization accuracy of 10% or less and the average localization accuracy is 2 m.
Key words: wireless sensor network(WSN)； inbuilding localization； multilateral localization