脉冲耦合和分布式扩散相结合的时间同步协议  

Cooperative Time Synchronization Protocol with Pulse-coupled Oscillators and Distributed Diffusion

作　　者：李敏[1] 郑国强[1] 李济顺[2] 

机构地区：[1]河南科技大学电子信息工程学院,河南洛阳471023 [2]河南科技大学河南省机械设计及传动系统重点实验室,河南洛阳471023

出　　处：《电视技术》2014年第11期154-157,182,共5页Video Engineering

基　　金：国家科技重大专项(2012ZX04004011);河南省基础与前沿技术研究计划项目(122300413209);河南省教育厅科学技术研究重点项目(12B510010)

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。In view of the low precision and scalability of synchronization protocol for the large-scale wireless sensor networks （WSN） , a novel coopera- tive 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 pha- ses are changed by the pulse coupled signal. The tick synchronization is achieved by distributed diffusion. In second phase, the average time of master- node 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 synchro- nize the network quickly with good precision convergence speed and scalability.

关 键 词：无线传感器网络 脉冲耦合振荡器 协作同步 分布式扩散 

分 类 号：TN929.5[电子电信—通信与信息系统]