Temperature perception-based wireless sensor network time synchronization method

A wireless sensor and network time technology, applied in the field of wireless networks, can solve the problem that the synchronization method cannot be applied to large-scale networks.

Active Publication Date: 2014-11-26
NORTHWEST UNIV
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Problems solved by technology

[0008] The sensor network time synchronization method working in a large-scale field environment is significantly different from the method in a normal environment. Aiming at the current situation that the existing synchronization method cannot be applied to a large-scal

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  • Temperature perception-based wireless sensor network time synchronization method
  • Temperature perception-based wireless sensor network time synchronization method
  • Temperature perception-based wireless sensor network time synchronization method

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Embodiment Construction

[0062] In order to ensure the smooth progress of the dormant scheduling process and the correctness of the data processing results in the data fusion stage in large-scale monitoring such as wildlife monitoring and earthen site monitoring, the applicant needs to establish a time synchronization strategy with high precision and low energy consumption. However, there are two problems in the large-scale field environment compared with the ordinary network environment: 1) the large network scale leads to a rapid increase in the energy consumption of node communication and the cumulative error of time synchronization; 2) the dynamic change of the environment leads to unstable communication between nodes. Stable, unable to maintain continuous normal communication.

[0063] Aiming at the current situation that the existing time synchronization method is not suitable for large-scale field environment, the present invention proposes a time synchronization method based on temperature sens...

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Abstract

The invention discloses a temperature perception-based wireless sensor network time synchronization method comprising steps of sensitiveness factor determination, sensitiveness factor interval determination, and local time updating. According to the method, during frequency offset estimation, the influence on the node frequency offset by the current environment temperature change of the node is taken into consideration, thereby improving precision of the frequency offset estimation. Meanwhile, because the method is mainly dependent on local information during the time synchronization process, the number of times for information transmission is substantially reduced, thereby reducing the energy consumption to the great extent and reducing error accumulation caused by information transmission in a layer-by-layer mode. Besides, because the method relies less on information transmission, a problem of unstable communication caused by the severe weather and dynamic node position changing and the like in the field environment can be solved.

Description

technical field [0001] The invention relates to the technical field of wireless networks, in particular to a temperature-sensing-based time synchronization method for a wireless sensor network, which is suitable for large-scale regional monitoring wireless sensor network applications such as wild animal monitoring and earthen site monitoring. Background technique [0002] As an important supporting technology of wireless sensor networks, time synchronization has been widely used, such as data fusion technology, sleep scheduling technology, TOA-based positioning technology and target tracking, all of which require the nodes of the entire network to maintain time synchronization. In a large-scale sensor network, there are many network nodes, and the energy, processing power, and bandwidth of the nodes are relatively limited, and the network environment is relatively harsh. Therefore, this requires the sensor network time synchronization algorithm to have low communication overh...

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Application Information

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IPC IPC(8): H04W56/00
CPCY02D30/70
Inventor 金梦房鼎益陈晓江刘晨徐丹郭军
Owner NORTHWEST UNIV
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