Precision Clock Synchronization Method Based on Adaptive Kalman Filter

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Integrated Circuits and Embedded Systems ›› 2023, Vol. 23 ›› Issue (5) : 59-64.

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Precision Clock Synchronization Method Based on Adaptive Kalman Filter

Zhang Weiran, Hou Yanhong

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Abstract

In order to reduce clock fluctuation caused by network delay jitter and clock deviation caused by frequency inconsistency and drift,a frequency deviation model and a synchronization system based on Kalman filter are established.In order to avoid the problem of empirical estimation of measurement noise by Kalman filter and reduce the clock fluctuation caused by inconsistent measurement period of Sage-Husa algorithm,the weight coefficient and measurement noise calculation formula of Sage-Husa algorithm are modified.In order to reduce the influence of outlier on strong tracking algorithm and improve the accuracy of strong tracking algorithm,an outlier detection and processing algorithm is designed and the formula of strong tracking algorithm is modified.The experiment results show that the scheme is effective in the aspects of robustness,tracking,clock accuracy and stability.

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IEEE1588 / Kalman filter / delay jitter / frequency deviation

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Zhang Weiran, Hou Yanhong. Precision Clock Synchronization Method Based on Adaptive Kalman Filter[J]. Integrated Circuits and Embedded Systems. 2023, 23(5): 59-64

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