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Adaptive time synchronization method based on temperature compensation

A technology of time synchronization and temperature compensation, which is applied in the direction of synchronization, synchronization devices, clocks driven by synchronous motors, etc., can solve problems such as aging problems that have not been resolved, node clocks that cannot be timely, and sensor nodes that cannot meet the requirements of long-term operation. , to achieve good synchronization, improve energy efficiency, and improve performance

Active Publication Date: 2018-08-24
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the above method has not solved the aging problem, and cannot timely and better adjust the actual situation of the node clock. Therefore, this method cannot meet the long-term running requirements of the sensor node.

Method used

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  • Adaptive time synchronization method based on temperature compensation
  • Adaptive time synchronization method based on temperature compensation
  • Adaptive time synchronization method based on temperature compensation

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Embodiment Construction

[0050] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] The overall frame diagram of the present invention is as figure 1 As shown, the transition of the system from the calibration state to the self-learning state and the least square linear fitting method in the present invention will be described in detail below in conjunction with the accompanying drawings.

[0052] In this embodiment, the temperature-crystal frequency model of a node is firstly described:

[0053] 1. Transition from a calibration state to a self-learning state

[0054] In order to improve the reliability of the mechanism, the present invention starts the device in the model with a pre-calibrated drift temperature model. The model is obtained from a subset of devices whose initial characterization is performed during fabrication.

[0055] The present invention proposes a method for smooth transition from pre-calibrat...

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Abstract

The invention relates to an adaptive time synchronization method based on temperature compensation, belonging to the technical field of wireless sensor networks. In consideration of the large influence of the environmental temperature on a clock crystal oscillator frequency, the method includes the following steps: firstly, a temperature-crystal oscillator frequency model is established by using the correlation between the clock drift and temperature, and nodes can compensate for the offset of a clock according to the temperature changes under the model to improve the accuracy of synchronization between the nodes; and secondly, in the case that the network delay is a Gaussian model, and in combination with the relevant theory of probability time synchronization, the nodes can compensate for the current time according to a maximum synchronization error allowed by the network and the accumulated clock offset, and estimate a corresponding resynchronization interval. According to the method, the nodes can reduce the energy consumption to the greatest extent on the basis of meeting the specific synchronization accuracy, and the network load can be reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, and relates to an adaptive time synchronization method based on temperature compensation. Background technique [0002] The time synchronization of nodes in the entire network is the basis of most wireless sensor network application technologies, and it is crucial to the realization of technologies such as data fusion, sleep scheduling, node positioning, and target tracking. However, due to the influence of various factors such as differences in crystal slices and related clock circuits, instability of node working environments (such as temperature, operating voltage, vibration, and humidity, etc.), differences in node manufacturing processes, and aging of crystal oscillators, the actual output of node crystal oscillators There is a certain difference between the oscillation frequency and its nominal frequency. The above conditions cause the local clocks of each node in the whol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04W84/18G04G3/04G04G7/00
CPCG04G3/04G04G7/00H04W56/001H04W84/18Y02D30/70
Inventor 谢昊飞熊辉辉王平高兴柯俊逸艾尔帕提·艾尔肯李航
Owner CHONGQING UNIV OF POSTS & TELECOMM
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