具有漂移补偿的RCR时钟同步模型  

A RCR Clock Synchronization Model with Drift Compensation

作　　者：全渝娟[1] 刘桂雄[2] 刘波[2] 洪晓斌[2] 

机构地区：[1]暨南大学计算中心,广东广州510632 [2]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2010年第5期76-79,85,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省科技计划项目(2008B010200012);教育部新世纪优秀人才支持计划项目(NCET-08-0211)

摘　　要：针对基于以太网的工业测控系统时钟同步,探讨了低同步代价下实现较高同步准确度的问题.提出一定同步准确度下具有漂移补偿的远端时钟读取(RCR)时钟同步模型,它具有提高每一次同步准确度、简化远端时钟读取成功判断的特点,可降低整个系统同步的计算量.通过给出集成时间戳报文的数字锁相环漂移补偿,实现了一定同步准确度下具有漂移补偿的RCR时钟模型的同步架构及仿真.结果表明,该模型可将目前常见的基于报文传输延迟测算的时钟同步方法NTP的准确度至少提高一个数量级.Aiming at the high-accuracy clock synchronization with low cost in the industrial measurement and control system based on Ethernet,this paper presents a RCR（Remote Clock Reading） clock synchronization model with drift compensation,which is predominant in the precision of synchronization and the simplification of synchronization judgment and computation.Then,the architecture of the model is presented by integrating Timestamp Digi-tal Phase-Locked Loop in drift compensation,and the corresponding simulation is performed.Simulated results show that,as compared with the conventional message delay-based clock synchronization method NTP,the proposed model is more accurate,with an accuracy increase of one order of magnitude at least.

关 键 词：时钟同步 漂移补偿 延迟测算 以太网 工业测控系统 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TP393[自动化与计算机技术—控制科学与工程]