基于卡尔曼滤波的网络精确时钟同步研究

在网络化分布式测试与控制系统中,时钟同步是一项重要的课题研究指标.在基于IEEE 1588协议主从时钟的时钟同步中,时钟偏差和时钟漂移的精确测量是主从时钟同步的重要保证.提出了基于卡尔曼滤波的时钟同步方法,该方法不仅能对主从节点之间的时钟漂移进行估计、优化时钟模型,还能实现对时钟偏差的估计,消除传输网络中的干扰.实验结果表明,在时钟同步中引入卡尔曼滤波算法能显著提高时钟同步精度.

Research on Precise Time Synchronization Based on Kalman Filter

Time synchronization accuracy is an important topic in distributed control system.In time synchronization based on IEEE 1588,the clock offset and clock skew between master clock and slave clock are critical parameters in master slave structured network.A method of time synchronization based on Kalman filter is proposed.On one hand,the clock skew is estimated and the clock model is modified,on the other hand,the clock offset is estimated and the impact of the noise is eliminated.The experimental results demonstrate that the proposed method can significantly improve the accuracy of time synchronization.