Method for precisely synchronizing time of industrial wireless network on basis of prediction and compensation

Abstract

The invention relates to technologies for industrial wireless networks, in particular to a method for precisely synchronizing time of an industrial wireless network on the basis of prediction and compensation. The method includes constructing the factory-automation-oriented industrial wireless network into a star network on the basis of an IEEE (institute of electrical and electronics engineers) 802.11 single-hop basic service set (BBS) structure; setting a master clock and slave clocks according to types and functions of nodes in the industrial wireless network; enabling a master clock side and slave clock sides to interact with one another via two-way timestamp information and computing a time deviation value of a current synchronizing cycle; predicting a time deviation value of a next synchronizing cycle by the aid of the time deviation value of the current synchronizing cycle; compensating clock drift by the aid of the predicted time deviation value of the next synchronizing cycle and correcting the clocks. The method has the advantages that the method is implemented on the premise that application requirements of factory automation are sufficiently considered, so that high time synchronization precision can be realized by the aid of few wireless communication resources, and purposes of high precision, high efficiency, low expenditure and easiness in implementation can be achieved.

Description

technical field [0001] The invention relates to industrial wireless network technology, in particular to a high-precision time synchronization method for industrial wireless networks based on prediction and compensation. Background technique [0002] Industrial wireless network technology is another hot technology in the field of industrial measurement and control after fieldbus. It is a revolutionary technology that reduces the cost of industrial measurement and control systems and improves the scope of application. It is also a new growth point for industrial automation products in the next few years. Industrial wireless network technology is suitable for harsh industrial site environments. It has technical characteristics such as strong anti-interference ability, low energy consumption, and real-time communication. The new wireless technology standard. At present, industrial wireless network technology is gradually applied in the field of high-speed factory automation, a...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the existing time synchronization method does not consider the clock drift or the time synchronization error caused by synchronization failure, the present invention proposes a high-precision time synchronization method for industrial wireless networks based on prediction and compensation, which is oriented to IEEE 802.11 star network and TDMA The resource allocation mechanism predicts the time deviation of the next synchronization cycle through the two-way interactive timestamp information, and the node gradually calibrates its own clock according to the predicted time deviation value, avoiding the problem of too large time deviation caused by synchronization failure, and further reducing the time synchronization error

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