【摘要】 针对WSN同步精度较低、可扩展性差的问题,提出基于脉冲耦合和分布式扩散相结合的协作时间同步协议,将同步分为时钟节拍同步和时间同步两个阶段。时钟节拍同步阶段,通过脉冲信号耦合来改变节点相位实现节拍同步;时间同步阶段,基于双向信息交换模式,把主节点域的平均时间扩散有限的跳数,采用互扩散使节点时间近似同步到网络节点的平均时间上,实现时间同步。结果表明:该协议同步精度更高,收敛速度较快,扩展性较好。更多还原

【Abstract】 In view of the low precision and scalability of synchronization protocol for the large-scale wireless sensor networks( WSN),a novel cooperative time synchronization protocol based on pulse-coupled oscillators and distributed diffusion( CTS) is proposed in this paper. The protocol divides the synchronization into two phases: clock tick synchronization phase and time synchronization phase. In the first phase,the pulse-coupled oscillator’s phases are changed by the pulse coupled signal. The tick synchronization is achieved by distributed diffusion. In second phase,the average time of masternode domain is spread to a limited number of hops based on two-way message exchange mechanism. It adopts the method of mutual diffusion to finish the approximately synchronization between the node time and the average time of all nodes. The analysis and simulation results reveal that CTS can synchronize the network quickly with good precision convergence speed and scalability.更多还原