关键词: 无线传感器网络, 节点定位, 定位精度, DV-Hop, 质心算法

Abstract: In view of node location problems in the wireless sensor networks, in order to improve the positioning accuracy of unknown nodes, in this paper, a hierarchical location algorithm which has nothing to do with the distance（IDV-Hop+IMP） is put forward. IDV-Hop method is proposed for normal nodes which have less than three neighbor anchors; IMP method is proposed for normal nodes which have three neighbor anchors; the weighted centroid location algorithm is proposed for normal nodes which have more than three neighbor anchors. Under the environment of sparse anchor nodes, simulation results show that while guaranteeing the positioning coverage, IDV-Hop+IMP algorithm has higher positioning accuracy than DV-Hop and centriod algorithm.

Key words: wireless sensor networks, node location, positioning accuracy, DV-Hop, centroid algorithm