关键词: 无线传感器网络；定位算法；未知节点；信标节点；路径损耗；

Abstract:

In wireless sensor networks, it is critical for monitoring activities to determine the node location or the location of an incident. The exact location of a node is not only the premise of providing monitoring events or monitoring the target location information, but also the basis of providing network topology configuration, improving routing efficiency, reporting network coverage quality, providing namespace for the network and other network functionalities. Therefore, in the paper, a centroid location algorithm for wireless sensor networks’ positioning is improved. For the general location of the unknown nodes, the  algorithm has new amendments. The weighting factors in the unknown node location determining algorithm are optimized. These improvements make the unknown node positioning error and positioning precision more accurate. Compared with the previous weighted centroid location algorithm, the  simulation results in this paper show that the improved centroid location algorithm has greatly improved in positioning error and positioning precision.

Key words: wireless sensor networks;location algorithm;unknown node;beacon nodes;path loss