关键词: 无线传感器网络, 定位精度, 粒子群优化算法, 节点定位

Abstract: Most previously proposed algorithms assume that nodes are deployed in planar area，however，these algorithms are unable to locate nodes of three-dimensional nets.For improving the positioning accuracy，this paper uses the Particle Swarm Optimization algorithm to achieve the positioning for wireless sensor networks.It computes the positions of unknown nodes using the Particle Swarm Optimization algorithms according to the positions of anchor nodes and unknown nodes.Through simulation and the least-squares method for the simulation results of the comparison，the results show that the algorithm can improve the node positioning accuracy effectively without increasing cubage，cost and power consumption.

Key words: wireless sensor network, positioning accuracy, Particle Swarm Optimization（PSO）, node-positioning