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IEEE 1588-based synchronization system and synchronization method thereof

A technology for synchronizing systems and system time, applied in transmission systems, synchronizing devices, digital transmission systems, etc., can solve the problems of reducing synchronization accuracy without considering the machine accuracy of embedded systems, and achieve the effect of high clock synchronization accuracy

Active Publication Date: 2013-07-03
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

However, the proposed frequency compensation method does not consider the limited machine precision of the embedded system, that is, the impact of the truncation error, when calculating the frequency ratio of the master-slave clock, thereby reducing the final synchronization accuracy

Method used

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  • IEEE 1588-based synchronization system and synchronization method thereof
  • IEEE 1588-based synchronization system and synchronization method thereof
  • IEEE 1588-based synchronization system and synchronization method thereof

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Embodiment Construction

[0027] The embodiments of the present invention will be described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention. Detailed implementation modes and specific operation procedures are given, but the protection scope of the present invention is not limited to the following implementations. example.

[0028] This embodiment includes: a master device and a slave device connected through a network, where the master device includes a master clock module and a CPU management control module, and the slave device includes a slave clock module and a CPU management control module.

[0029] The master clock module is composed of a clock timer and a crystal oscillator. The clock counter realizes the output of the local system time and increases the system time by one clock period when triggered. The crystal oscillator is used to generate the work of the module The clock is output to the CPU management control module.

[0030] The ...

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Abstract

The invention discloses an IEEE 1588 accurate clock synchronization protocol-based synchronization system and a synchronization method thereof in the technical field of wireless communication. The system consists of master equipment and slave equipment which are connected through a network, wherein the master equipment comprises a main clock module and a central processing unit (CPU) management control module; and the slave equipment comprises a slave clock module and a CPU management control module. Due to the adoption of a frequency compensation clock provided by Balasubramanian and the like, a frequency adjustable clock counter is constructed and the frequency compensation function is realized; and an improved clock synchronization method is adopted, the limited machine precision of anembedded system, namely influence brought by truncation errors is considered; therefore, higher clock synchronization accuracy is achieved.

Description

Technical field [0001] The present invention relates to a device and method in the field of wireless communication technology, in particular to a synchronization system and a synchronization method based on the IEEE 1588 precision clock synchronization protocol. Background technique [0002] In recent years, Ethernet has received more and more attention due to its openness, mature technology, high transmission rate, wide application, and low price, and has a trend of further application to industrial sites. However, because its MAC layer protocol adopts CSMA / CD, it has the defect of uncertain queuing delay, making it unable to be effectively used in industrial control. The "uncertainty" of the response time (ie poor real-time performance) and the "asynchrony" of the various modules in the system have become the bottleneck that hinders the "one network to the end" of Ethernet technology. Among them: Some industrial sites require extremely high clock synchronization accuracy, whic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04J3/06
Inventor 许雄熊振华朱向阳盛鑫军
Owner SHANGHAI JIAOTONG UNIV
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