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Wireless sensor network time synchronization method

A wireless sensor and network time technology, applied in the direction of synchronization device, wireless communication, network topology, etc., can solve the problem of low time synchronization accuracy of wireless sensor network, and achieve the effects of accurate time difference, high time synchronization accuracy, and accurate time synchronization method

Active Publication Date: 2016-12-14
HEFEI UNIV OF TECH
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Problems solved by technology

[0012] The main purpose of the present invention is to solve the problems such as the low accuracy of wireless sensor network time synchronization, and propose a method for wireless sensor network time synchronization with a time comparator in the node to be synchronized

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Embodiment Construction

[0032] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples.

[0033] figure 1 It is a flow chart of the method of the present invention. As can be seen from this figure, the present invention includes three stages, such as coarse correction operation, fine correction operation and delay stage, wherein the coarse correction operation is the first stage, the fine correction operation is the second stage, and the two stages The interval time is recorded as N;

[0034] figure 2 It is a system structure diagram of the present invention. figure 2 Node A is the reference node, node B is the node to be synchronized and the time comparator is included in the node B to be synchronized, nodes A and B have separate timing clocks, wherein the timing clock of node A is the reference clock, and the timi...

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Abstract

The invention relates to a wireless sensor network time synchronization method, which comprises coarse timing and fine timing operation. Each node in the wireless sensor network is provided with an independent timing clock; a data communication ability is realized between nodes; a to-be-synchronized node B carries out coarse timing and fine timing operation on a reference node A at each T time to enable the time of the to-be-synchronized node B and the time of the reference node A to be consistent. Compared with the traditional wireless sensor network time synchronization method, the method of the invention can carry out time synchronization on the wireless sensor network node more accurately.

Description

technical field [0001] The invention relates to a method for time synchronization of a wireless sensor network, which enables a node to be synchronized to maintain time synchronization with a reference node through two operations of coarse time correction and fine time correction. technical background [0002] At present, wireless sensor networks have played a pivotal role in military, industrial, agricultural, environmental, medical and so on. In some applications, wireless sensor network nodes need to perform specific tasks together at exactly the same time point, therefore, time synchronization technology is very important for these applications of wireless sensor networks. [0003] The timing clock inside each node of the wireless sensor will deviate from the calibrated frequency due to the impact of the crystal oscillator manufacturing process, working environment, crystal impurity or crystal aging, resulting in frequency drift within the node; The time of the nodes is...

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Application Information

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IPC IPC(8): H04W56/00H04W84/18
CPCH04W56/0015H04W84/18
Inventor 孙伟余浩王建平李奇越穆道明朱程辉徐晓冰秦剑
Owner HEFEI UNIV OF TECH
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