基于IEEE1588的时钟同步技术研究

摘要

The rapid development of distributed measurement control system puts forward higher request for the clock synchronization precision. IEEE1588 is a protocol on the network measurement and control system,and with it,the clock synchronization can realize high precision. This paper analyzes the principle of best master clock ( BMC ) algorithm and the time synchronization process of local clock and master clock;Puts forward a IEEE1588 realization scheme,provides a hardware design method,and elaborates the master-slave clock software design process. On the basis of the work, verifies the master-slave clock synchronization, and experiments show that the method is feasible, clock synchronization precision can reach submicrosecond, and the test of different length of network cables demonstrates the design basically eliminates the impact of fixed network latency.%分布式测量控制系统的快速发展对时钟同步精度提出了更高的要求,IEEE1588协议是关于网络测量和控制系统的协议,可实现高精度的时间同步；深入分析了IEEE1588协议的最佳主时钟(BMC)算法原理和本地时钟同步主时钟的过程；提出了一种在物理层加盖时间戳的IEEE1588实现方案,提供了硬件设计方法,阐述了主从时钟的软件设计流程.在此基础上对主从时钟的同步进行了验证.实验证明:该方法是切实可行的,时钟同步精度可达亚微秒级；通过不同网络电缆长度的测试,证明该设计基本消除了固定网络延迟造成的影响.