无线传感器网络混合定位技术研究

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。

Research on hybrid location technology in wireless sensor networks

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 location is used to make up for the shortcomings of TDOA location which can not cover a large area.On the other hand,the ranging-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 result shows that this hybrid positioning technology has successfully achieved the fusion of TDOA,RSSI and DV-hop positioning technologies,and effectively improved the localization accuracy in the complex large-scale wireless sensor networks.