基于IEEE1588协议的从时钟设计及其控制研究

Research on Slave Clock Design and Control Based on IEEE1588 Protocol

时钟漂移与传输迟延的不确定性是影响同步精度的主要原因,通过分析IEEE1588协议原理,设计了从时钟结构。实际通信网络存在很多不确定性和延时抖动,固定不变的PI控制器参数往往很难达到满意的对时精度。设计了运用粒子群优化算法对控制器参数进行在线整定的从时钟伺服控制系统,Matlab仿真结果表明,该控制方法具有较高的精度和自适应能力,在网络参数或从时钟发生变化时也能很好地保持同步精度。

The uncertainty of clock drift and transmission delay are the main reasons for the synchronous precision.By analyzing the principle of IEEE1588 protocol, this paper designed the structure of the clock. Due to the uncer-tainty and delay jitter of the practical communication network, fixed PI controller parameters is difficult to achievesatisfactory synchronization precision. The slave clock servo control system with controller parameters online settingby using particle swarm optimization algorithm is designed. The simulation results in Matlab show that the proposedcontrol method has higher precision and adaptive ability, and can keep synchronization accuracy when the networkparameters or slave clock frequency changes.