关键词: 无线传感器网络, 距离矢量（DV）-Hop, 定位, 坐标修正

Abstract: Self-positioning of sensor nodes is one of the important researches in the wireless sensor networks. The main error source of DV-Hop localization algorithm is the estimation error of the distance between unknown nodes and anchor nodes. In order to reduce the error, this paper introduces the ideal anchor nodes’ distance. It is used to exclude a part of average single-hop distance calculated by anchor nodes that has large errors. It’ll fix the network-wide average single-hop distance. Then it will correct the coordinates of unknown nodes that are obtained by the least squares. The simulation results show that, the algorithm can effectively improve the positioning accuracy of the nodes. And the algorithm has low requirement on the number of anchor nodes and the communication radius. It can effectively save energy and cost of the network.

Key words: wireless sensor networks, Distance Vector（DV）-Hop, location, coordinate correction