基于RSSI的室外无线传感网络自定位算法

Outdoor Wireless Sensor Network Self-localization Algorithm Based on RSSI

针对室外无线传感网络的节点自定位问题,对野外环境无线电传播路径损耗模型进行分析,提出加权质心定位算法,并结合优选信标节点的规则进一步提高了节点定位精度。加权质心定位算法计算简单,定位过程中节点间通信开销小,定位精度较极大似然估计法高,仿真结果表明其基本满足应用要求。

Self-localization of nodes is one of the key technologies for application of Wireless Sensor Network（WSN）. By analyzing the model of waves propagation in outdoor, this paper provides a weighted centroid localization algorithm. Combined with the rules of selecting fine nodes, it uses weight coefficient to evaluate position accuracy of nodes. This algorithm is simple and no communication is needed while locating and its location accuracy is higher than maximum likelihood estimation. The simulation using Matlab shows that this algorithm basically meets the application＇s need.