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Clock synchronization method based on delay measurement

A technology of clock synchronization and link delay, which is applied in the field of electronics and communication, can solve the problems of inability to achieve synchronization accuracy and different time signal delays, and achieve the effect of reliable time synchronization scheme, high synchronization accuracy and guaranteed accuracy

Inactive Publication Date: 2018-10-19
西安电子科技大学昆山创新研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, this timing method can only meet the time synchronization accuracy requirements of the ms level due to the different delays of the time signal transmitted to different terminals through the channel.
However, in the field of industrial control, some systems that require very strict time synchronization, the current Internet Network Time Protocol (NTP), Simple Network Time Protocol (SNTP), etc. cannot meet the required synchronization accuracy

Method used

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  • Clock synchronization method based on delay measurement
  • Clock synchronization method based on delay measurement
  • Clock synchronization method based on delay measurement

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Embodiment 1

[0059] See figure 1 , figure 1 It is a flow chart of a clock synchronization method based on delay measurement provided by an embodiment of the present invention. The clock synchronization method of the present invention can be used for clock synchronization. Specifically, the method includes the following steps:

[0060] Step 1, respectively measuring the link delay between two adjacent equipment ports in the distributed network;

[0061]Step 2, each device port stores the link delay of the adjacent device port respectively;

[0062] Step 3, using the link delay to measure the time difference between corresponding two adjacent device ports;

[0063] Step 4. Using the time difference to complete the clock synchronization of each device in the distributed network.

[0064] Among them, before step 1, it may also include:

[0065] Step X1, the two adjacent devices send and receive announcement messages to each other;

[0066] Step X2, comparing clock information according to...

Embodiment 2

[0106] See figure 2 , figure 2 It is a schematic flowchart of an implementation of a clock synchronization method based on delay measurement provided by an embodiment of the present invention. This embodiment further describes the clock synchronization method in detail on the basis of the foregoing embodiments. Specifically, the following steps are included:

[0107] Step 1. Send and receive link delay measurement messages

[0108] Such as image 3 As shown, the connected devices are the first device and the second device respectively, the device where the master clock is located is the first device, and the device where the slave clock is located is the second device. Time measurement, the slave clock is the initiator of the delay measurement, and the master and slave devices obtain relevant information by sending messages. The message is the data unit exchanged and transmitted in the network, that is, the data block to be sent by the site at one time. The message conta...

Embodiment 3

[0131] Please continue to see image 3 and Figure 4 , image 3 It is a schematic diagram of the principle of measuring link delay of a clock synchronization method based on delay measurement provided by the embodiment of the present invention; Figure 4 It is a schematic diagram of the principle of measuring time difference in a distributed network clock synchronization method provided by an embodiment of the present invention. This embodiment describes the clock synchronization method in detail on the basis of the foregoing embodiments.

[0132] A distributed network is formed by the interconnection of node machines distributed in different locations and having multiple terminals. Any point in the network is connected to at least two lines. When any line fails, the communication can be completed through other links, which has high reliability. At the same time, the network is easy to expand.

[0133] Preferably, all nodes in the distributed network constitute a clock syn...

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Abstract

The invention relates to a clock synchronization method based on delay measurement. The method includes measuring link delay of a master clock and a slave clock; measuring time difference between themaster clock and the slave clock; and using the master clock, the link delay and the time difference to complete clock synchronization of the slave clock. According to the clock synchronization methodprovided by the embodiment of the invention, through measurement of the link delay, and through calculation of the time difference between the master clock and the slave clock, and then realization of the clock synchronization, the time synchronization precision of the master clock and the slave clock reaches the nanosecond level, a relatively high clock synchronization precision requirement canbe met, and through periodic clock synchronization, the clock synchronization method can maintain clock synchronization of the master clock and the slave clock for a long time, and ensure the precision of clock synchronization within a long time.

Description

technical field [0001] The invention belongs to the field of electronics and communication, and in particular relates to a clock synchronization method based on delay measurement. Background technique [0002] In the communication field, clock synchronization plays a very important role in voice, video and other services. With the development of modern information technology, the accuracy requirements of network clock synchronization are getting higher and higher. [0003] The time synchronization link of the traditional network clock synchronization is realized by using NTP (Network Time Protocol) transmission mode, that is, a unified and standard time is transmitted on the Internet. Specifically, by specifying a number of clock source sites on the network, for Users provide timing services, and these sites should be able to compare with each other to improve accuracy. The accuracy can reach 0.1ms in the local area network, and the accuracy can reach 1-50ms in most places ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
CPCH04J3/0667
Inventor 陈晨马玉新刘超梁小成殷廷瑞吕高登
Owner 西安电子科技大学昆山创新研究院
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