A clock source reliability guarantee method suitable for master-slave time synchronization method

Abstract

The invention provides a clock source reliability safeguard mechanism suitable for a master-slave mode time synchronization method and belongs to the technical field of onboard network communication.The master-slave mode time synchronization method has the advantages of being simple, easy to realize, high in efficiency and the like, but also has a problem of low reliability. If a clock source isin fault, the whole time synchronization process goes wrong or paralyzes. In order to reduce negative influences from the clock source fault to the master-slave mode time synchronization, a clock ratespecific ratio between a clock main node and a clock slave node is adopted as a judgment basis to judge whether the clock state of the master clock and the clock state of the slave node are in consistence; then whether the state of the current clock source is normal or not and whether the clock reference source is necessary to select again are determined through a voting mode. Meanwhile, adjacentslave nodes monitor the running state of each other to reduce the influence from wrong nodes to the voting result of the clock source.

Description

technical field [0001] The invention belongs to the technical field of airborne network communication, and relates to a method for ensuring the reliability of a clock source. Background technique [0002] Time synchronization is the basic condition of time-triggered Ethernet (Time-Triggered Ethernet, TTE) communication. The idea of ​​the master-slave time synchronization method is to select a node as the time reference source (clock source), which is generally called the clock master node, and other nodes will synchronize their local time information to the time reference of the master node. It has the advantages of low overhead and fast convergence. However, if the clock source fails and cannot provide a correct time reference, the time synchronization of the entire network will be wrong. Therefore, the reliability of the clock source strictly limits the reliability of the entire network time synchronization service, and it is difficult to apply to the time-triggered Ethe...

AI Technical Summary

Problems solved by technology

However, if the clock source fails and cannot provide the correct time reference, the time synchronization of the entire network will be wrong

Therefore, the reliability of the clock source strictly limits the reliability of the entire network time synchronization service, and it is difficult to apply to the time-triggered Ethernet communication system that requires high reliability.

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