Precise clock synchronization implementation method based on PTPd2 protocol

Abstract

The invention relates to a precise clock synchronization implementation method based on the PTPd2 protocol, belonging to the field of communication technology and computer networks. The invention realizes precise clock synchronization through an interactive communication message of master and slave clock devices, and the PTPd2 protocol can obtain an precise timestamp of the message arriving at thenetwork driver layer of the master and slave clock devices; compared with the timestamp obtained by the NTP protocol at the application layer, the interference of the protocol stack can be effectively avoided; at the same time, by capturing the time of the message reaching the MAC layer of the master and slave clock devices, and compensating for the delay and jitter generated by transmitting themessage from the network driver layer to the MAC layer in the master and slave clock devices, the clock synchronization precision can be improved. Tests show that when the master clock device and slave clock device are directly connected through a network cable, the parameters are reasonably set and the boundary time is compensated, the clock synchronization precision can reach 19[Mu]s; the universality is good; and the precise clock synchronization implementation method based on the PTPd2 protocol is easy to implement.

Description

technical field [0001] The invention relates to the field of communication technology and computer network, in particular to a method for realizing precise clock synchronization based on the PTPd2 protocol. Background technique [0002] With the rapid development of information technology, clock synchronization technology has become a key technology in distributed measurement and control systems, and the requirements for clock synchronization accuracy are getting higher and higher in many occasions. The traditional NTP (Network Time Protocol) protocol has a synchronization accuracy of 10 milliseconds in a wide area network with a range of 2000 kilometers, and a synchronization accuracy of 1 millisecond in a local area network. This millisecond-level accuracy is no longer suitable for higher accuracy. ; Although GPS has a synchronization accuracy of 100ns, the access equipment of GPS is expensive, difficult to site and install, and there are political risks, so it is not suit...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a precise clock synchronization implementation method based on the PTPd2 protocol, to solve the problem that the clock synchronization accuracy is affected by the interference of the operating system and the protocol stack when the message is transmitted from the network driver layer to the MAC layer in the master-slave clock device question

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