无线传感器网络中基于层次结构的时间同步算法

摘要

时间同步作为无线传感器网络的关键技术之一,对整个网络的工作和发展有着至关重要的作用.提出了基于层次结构的传感器网络时钟同步协议(TPSN)改进算法:在层次建立阶段采取等级广播,在同步阶段采取直接双向和间接双向相结合的时间同步方式,获得相对较少的报文开销和系统维护开销；进行了时间频率偏移校正,以保证节点的时间同步精度.仿真实验结果表明,该算法不仅提高了网络的同步精度,也节约了网络的能量消耗,更加满足实际应用的需求.%Time synchronization is one of the key technologies for wireless sensor networks, and it plays an irreplaceable role for the work and development of the entire wireless sensor network- This paper proposed an improved Timing-sync Protocol for Sensor Networks (TPSN) algorithm based on hierarchy. This algorithm took level-broadcast in phase of level establishment, and a combined active and inactive two-way synchronization algorithm was used in phase of time synchronization, obtaining a relatively small cost of packet and system maintenance. This improved algorithm carried out time-frequency offset correction, and ensured the accuracy of the node. The improved TPSN algorithm not only enhances the accuracy of synchronization, but also saves the energy consumption for the network.