Method for enhancing clock synchronization accuracy in distributed network system

A distributed network, clock synchronization technology, applied in the direction of synchronization signal speed/phase control, transmission system, synchronization device, etc.

Inactive Publication Date: 2010-09-22
ZHEJIANG UNIV
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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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  • Method for enhancing clock synchronization accuracy in distributed network system

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Embodiment Construction

[0018] 2. According to the time deviation in the above step 1, compare it with the deviation value configured by the user through the register. If it is greater than the deviation value configured by the user through the register, discard the time deviation calculated this time and do not correct the system time. At the same time, we can analyze that this result is caused by an occasional large disturbance in the network. If it is less than or equal to the deviation value configured by the user through the register, adjust the time of the local slave clock according to the time deviation value;

[0019] 3. If the time deviation between the adjacent second local slave clock and the master clock is still greater than the deviation value configured by the user through the register, it is judged that the current interference is not accidental, and the time difference between the local slave clock and the master clock is recorded. The time offset value of the local slave clock can...

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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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/027H04L7/04
Inventor 韩晓霞张艳陈金龙廉玉平霍明旭韩雁
Owner ZHEJIANG UNIV
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