A synchronization correction method based on ieee1588 clock model

Abstract

The invention discloses a synchronous correction method based on an IEEE1588 clock model, which belongs to the technical field of communication. The method performs the following steps: 1) Obtain the time point of the IEEE1588 clock model, and obtain each timestamp; 2) Obtain the relationship between the server's time and the client's time from the IEEE1588 clock model, and combine the PTP protocol to obtain the Sync report 3) Perform differential operations based on the relationship between time stamps; 4) From the first-order difference value given in step 3), the asymmetric bias of the nth exchange process is obtained. Shift, and then through the exponentially weighted moving average filter to make the θ value close to zero to complete the correction between the server and the client. This method jumps out of the conventional thinking and compensates again on the basis of the IEEE1588 clock model, which solves the problem of end-to-end time asynchrony and makes the end-to-end interaction time symmetrical.

Description

technical field [0001] The invention relates to a clock synchronization correction method, which belongs to the technical field of communication. Background technique [0002] Using IEEE1588v2 and a specially designed clock recovery mechanism can provide clock synchronization accuracy up to microsecond or even submicrosecond level. And this is based on a very important assumption that the transmission delay of the data packet from the master clock to the slave clock and the transmission delay from the clock to the master clock are equal. In reality, however, the communication paths are not perfectly symmetrical, mainly due to different forward and reverse link delays and queuing delays. The difference in packet delay is mainly due to the different queuing engineering of packets of elements in the communication network, such as switches and routers. This is especially true when timing transfers are done end-to-end and there is no form of timing assistance from the network t...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to propose a synchronous correction method with a secondary calibration process based on the IEEE1588 clock model to solve the problem of time asymmetry between master and slave clocks.

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