无线传感器网络混合定位技术研究

Research on hybrid location technology in wireless sensor networks

在大规模复杂无线传感器网络中往往采用多种节点定位技术,在此结合现有无线传感器定位技术的现状,提出了一种混合定位技术以实现不同定位方法之间的互补。一方面利用RSSI定位弥补TDOA定位覆盖范围小的缺点;另一方面将测距信息引入到非测距定位DV-Hop算法中,用RSSI测距模型来提高DV-Hop算法中定位节点与信标节点间有效距离的精度。实验结果表明,该混合定位技术实现了TDOA,RSSI以及DV-HOP等定位技术的融合,有效地提高了复杂大规模无线传感器网络的节点定位精度。

Many kinds of node positioning methods are often used in large-scale wireless sensor networks. A hybrid positioning scheme is put forward in this paper to achieve the complementation between different positioning methods. RSSI loca- tion is used to make up for the shortcomings of TDOA location which can not cover a large area. On the other hand, the ran- ging-based information is introduced into the ranging-free localization algorithm DV-hop to improve the accuracy of effective distance between positioning node and beacon node in DV-hop algorithm by means of RSSI ranging model. The experiment re- sult shows that this hybrid positioning technology has successfully achieved the fusion of TDOA, RSSI and DV-hop positio- ning technologies, and effectively improved the localization accuracy in the complex large-scale wireless sensor networks.