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在无线传感器网络定位过程中,为减小传统DV-Hop算法的定位误差,降低定位精度对网络连通性的依赖性和控制定位成本,本文提出一种改进算法。算法利用一个带有GPS接收单元的移动信标节点,按照HILBERT路径遍历整个监测区域并周期性广播自己的位置信息;进而形成数个虚拟静态信标节点,选择未知节点一跳范围内的信标节点作为最优信标节点,通过RSSI赋予最优信标节点不同权值并用极大似然算法对未知节点进行定位。仿真结果表明,该算法有效地提高了定位精度和稳定性,同时也降低了定位成本。
In the process of wireless sensor network location, in order to reduce the positioning error of traditional DV-Hop algorithm, reduce the dependence of positioning accuracy on network connectivity and control the positioning cost, an improved algorithm is proposed in this paper. The algorithm traverses the entire monitoring area according to the HILBERT path and periodically broadcasts its own location information by using a mobile beacon node with a GPS receiving unit. Then, several virtual static beacon nodes are formed, and beacons within a hop of an unknown node are selected As the optimal beacon node, RSSI assigns optimal weight to beacon nodes and uses RSL to locate unknown nodes. Simulation results show that the proposed algorithm can effectively improve the positioning accuracy and stability and reduce the cost of positioning.