High-precision fixed-period PTP time synchronization method based on clock phase splitting

Abstract

The invention discloses a high-precision fixed-period PTP time synchronization method based on clock phase splitting, and the method comprises the steps that an FPGA generates a reference frequency signal according to a crystal oscillator signal, generates a reference frequency signal according to the reference frequency signal and transmits the reference frequency signal to a physical layer PHY chip, and an internal phase-locked loop of the physical layer PHY chip carries out the frequency multiplication of the reference frequency signal to generate a PYH clock reference signal, wherein the PYH clock reference signal is used as a counting frequency of an internal timing register of the physical layer PHY chip; and the physical layer PHY chip obtains a to-be-corrected message timestamp sent by the time synchronization message according to the internal timing register and obtains a final message timestamp according to a phase relationship between the to-be-corrected message timestamps.By means of the method, time synchronization of the master clock and the slave clock can be achieved, the synchronization precision can be improved by M times, and development of military industry, aerospace and other fields with high precision requirements for time synchronization is facilitated.

Description

technical field [0001] The invention belongs to the technical field of time synchronization, and in particular relates to a high-precision fixed-period PTP time synchronization method based on clock phase separation. Background technique [0002] With the gradual development of electronic informatization and networking, the requirements for time synchronization among various systems are getting higher and higher. The early NTP (Network Time Protocol) was the most widely used time synchronization protocol before, but the accuracy of the local area network Less than 10ms, still can not meet the accuracy required by measuring instruments and industrial control. In order to solve the timing synchronization needs of the distributed network of measurement and control applications, PTP (Precise Time Synchronization Protocol Standard for Network Measurement and Control Systems) was produced. At present, the time synchronization accuracy of ns level can be achieved, and it is continu...

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Problems solved by technology

[0013] The purpose of the present invention is to provide a high-precision fixed-period PTP time synchronization method based on clock phase separation to solve the problem that the PTP time synchronization accuracy in the prior art is not high enough

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