基于移动锚节点的加权质心定位算法研究

Study of weighted centroid localization algorithm based on mobile anchor nodes

针对加权质心定位(WSL)算法所需锚节点数目较多,定位精度低,定位成本高等问题,采用单个移动锚节点沿着既定的轨迹在监测区域移动,并在规定位置广播数据包;未知节点根据接收的信号强度(RSSI)比值以及邻居节点间的最小跳数确定权值,进而估算未知节点自身的坐标位置。仿真结果表明:算法有效地提高了定位精度和稳定性,降低了定位成本。

In view of the problems of many anchor nodes are needed,low positioning precision and high positioning cost of the weighted centroid localization（ WSL） algorithm,a WCL algorithm needs more anchor nodes.An improved WCL algorithm,WCL triangle received signal strength indication（ RSSI） hop（ WCL-TRH） based on single mobile anchor node aided is proposed. A mobile anchor node moves along the fixed route in monitor area,and broadcasts data packet in specified position; according RSSI ratios received by unknown node and minimum hops,weights are determined,the coordinate position of an unknown node is estimated. The simulation results show that the improved algorithm effectively improves the precision of positioning and stability,at the same time,reduce the costs of positioning.