机械振动监测中的无线传感器网络时间同步研究

Time Synchronization of Wireless Sensor Networks for Mechanical Vibration Monitoring

通过分析多节点时间同步误差对机械振动监测的影响,得出机械振动监测中无线传感器网络时间同步方法应具有微秒级精度、低功耗以及多跳同步的特点。提出了一种低功耗的多跳时间同步方法,在已有单跳同步方法的基础上,使用基于贪婪启发式的算法来选取多跳同步方法中的参考节点对,从而将该单跳同步方法扩展到多跳同步。仿真与实验表明,所提方法与经典同步方法RBS具有相同的同步精度,并且大幅降低了同步能耗,可以满足机械振动监测的要求。

By analyzing the effects of the multi-node time synchronization errors on mechanical vibration monitoring,it is indicated that the characteristics of time synchronization on mechanical vibration monitoring must be microsecond-level accuracy,low overhead and multi-hop synchronization.A low overhead multi-hop time synchronization approach was proposed herein.a known single hop synchronization approach was extended to multi-hop synchronization by employing a greedy heuristic algorithm to select reference nodes.The simulation and experimental results reveal that the proposed approach has the same synchronization accuracy as the well-known schemes reference broadcast synchronization and significantly reduces the energy consumption,which show that the proposed approach has a better performance for the mechanical vibration monitoring application.