Method for enhancing clock synchronization accuracy in distributed network system

Abstract

The invention relates to a method for improving the clock synchronization precision in a distributed network system. At present, the synchronized precision is relatively lower. Aiming at uncertainty and large disturbance, the invention only makes adjustment when the time offset between a local slave clock and a master clock is less than or equal to the offset value set through a register by the user; if the adjacent twice time offset is still more than the offset value, the invention adjusts the time of the local slave clock according to the time offset value. As the speed of a clock crystal oscillator is deviated, the time interval at which the local slave clock continuously twice sends sync synchronous messages to the master clock and the time interval at which the local slave clock continuously twice receives the sync synchronous messages from the master clock are compared, and then the difference between the two time intervals is evenly distributed within the synchronization interval. The method of the invention solves the problem of the decreasing of the clock synchronization precision to ensure the clock synchronization precision to reach microsecond level, through a filtering algorithm and the even adjustment of the offset of the crystal oscillator of the slave and the master clocks within the synchronization interval.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits and relates to a method for real-time synchronization in a distributed network system, in particular to a method for improving clock synchronization accuracy in a distributed network system based on the IEEE1588 protocol. Background technique [0002] The IEEE1588 standard protocol defines a clock synchronization protocol in measurement and automation systems, that is, the precision clock synchronization protocol PTP (Precision Time Protocol), which is suitable for distributed network systems and can achieve microsecond-level high-precision clock synchronization, making There is no need for dedicated synchronous communication when assigning control work, thereby achieving the effect of separating the communication time mode from the application program execution time mode. Due to the high-precision synchronous work, the data transmission time fluctuation inherent in the Ethernet techn...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method based on the IEEE1588 protocol to improve the accuracy of clock synchronization for the deficiencies of the prior art, thereby solving the above problems caused by network uncertainty The large disturbance problem and the consequences caused by the deviation of the speed of the clock crystal oscillator of each device

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