摘要
无线传感器节点定位在整个无线传感器网络体系中占重要地位。DV-Hop算法是一种免于测距的定位技术,其缺点是仅在节点均匀的密集网络中,才能合理估算节点的位置。针对这种情况,提出了一种基于移动信标的DV-Hop算法。利用一个移动信标节点在网络中按照事先规定的路径遍历整个网络区域,并周期性地广播自己的位置信息给周围的未知节点。未知节点通过有选择的组合估算多个自身位置,多个自身位置的质心即为最后估算的位置信息。最后通过仿真结果证明此种改进算法可以减小定位误差。
The localisation algorithm for the wireless sensor networks has important position in the wireless sensor network. DV-Hop is a kind of range-free localisation algorithm. Its defect is reasonable position estimate only in the node of the uniform dense network. In view of this situation, an improved DV-Hop algorithm based on mobile beacon dynamic seletion is proposed. A mobile beacon is used to move around the network according to predestinate path and broadcast messages with its localization information. Unknown node dynamic calculate its position through particular combinations and the final estimate the position information of node is centroid of multiple combination results. Simulation results prove that the algorithm can improve the localization precision.
出处
《科学技术与工程》
北大核心
2012年第7期1539-1543,共5页
Science Technology and Engineering
