Method and apparatus for master-salve clock synchronization

Abstract

The invention discloses a method and a device for synchronizing a master clock and a slave clock, the method comprises: sending synchronous request message to the master clock for many times in a simultaneous cycle by the slave clock, recording the corresponding the time value, then, utilizing a median average filtering algorithm to obtain the optimum time migration amount, utilizing the time migration amount to adjust the slave clock, eliminating the delay inequality which is caused by stochastic disturbance and burst interference of a network communication channel between the master clock and the slave clock, guaranteeing the stability of slave clock signals, and increasing the synchronous preciseness of the master clock and the slave clock.

Description

technical field [0001] The invention relates to a general-purpose clock synchronization technology, in particular to a master-slave clock synchronization method and device. Background technique [0002] The Institute of Electrical and Electronics Engineers (IEEE) 1588 protocol, which is called the precision clock synchronization protocol standard for network measurement and control systems, also known as the Precision Time Protocol (PTP, Precision Time Protocol), is a network clock synchronization protocol proposed by IEEE. The environment used to realize high-precision clock synchronization has been widely used in the fields of Ethernet, communication systems, distributed system measurement and control, etc., because its precision can reach microsecond level. [0003] The IEEE1588 protocol implements clock synchronization by exchanging clock synchronization packets. During the synchronization process, the slave clock sends a synchronization request message to the master cl...

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Problems solved by technology

[0023] However, since the application of the IEEE1588 protocol is based on the ideal condition that the transmission delay of the master-slave clock signal is symmetrical, it is difficult for the actual network channel to meet this condition

If there is random interference or burst interference in the clock transmission channel, the measured delay will have a large error, which will destroy the symmetry of the delay, and then affect the stability of the synchronization state of the master-slave clock and the stability of the slave clock. the accuracy of

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