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Method for synchronizing two-way time of wireless sensor network

A wireless sensor network and two-way time technology, applied in the direction of synchronization devices, wireless communications, electrical components, etc., can solve the problems of inability to completely eliminate the influence of critical path delay, unstable crystal oscillator frequency, high synchronization accuracy, etc., and achieve synchronization accuracy Effects of improving, improving accuracy, and prolonging the synchronization period

Inactive Publication Date: 2015-08-12
SUN YAT SEN UNIV
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Problems solved by technology

[0019] (2) Due to the small difference between the nominal frequency of the crystal oscillator and the actual frequency, and the change of external environmental factors such as changes in the temperature of the environment and unstable voltage of the node power supply, the frequency of the crystal oscillator will become unstable.
2) Furthermore, the general synchronization algorithm does not take compensation for frequency drift (skew), which will lead to a short synchronization period between nodes to maintain a certain synchronization error
[0048] According to the factors that affect time synchronization, the existing synchronization methods and time stamp recording technology must not completely eliminate the impact of critical path delays, which will cause them to fail to obtain the highest synchronization accuracy

Method used

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  • Method for synchronizing two-way time of wireless sensor network
  • Method for synchronizing two-way time of wireless sensor network
  • Method for synchronizing two-way time of wireless sensor network

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Embodiment 1

[0090] The invention proposes a high-precision wireless sensor network two-way time synchronization method, which is a synchronization algorithm based on a sender-receiver two-way synchronization mode. In the ZigBee network, the coordinator is generally selected as the reference node, and the sensor nodes are synchronized to the clock of the coordinator.

[0091] Specific implementation steps:

[0092] (a) At the initial stage when the sensor node sends a synchronization request message SYNC_REQ to the coordinator, when the physical layer transmits the synchronization header (the hardware detects the level shift), the sensor node immediately processes the sending interrupt event of the physical layer, and record time stamp T1;

[0093] (b) The sensor node writes the time stamp T1 into the TXFIFO register, embeds the time stamp into the SYNC_REQ message, and then sends the message to the coordinator bit by bit; it records, embeds, and sends T1 in the same message mark;

[00...

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Abstract

The invention discloses a method for synchronizing two-way time of a wireless sensor network. The method is a two-way synchronizing method based on a transmitter and a receiver. A sensing node is synchronized to a clock of a reference node. Physical layer time scale recording technology and time scale embedding technology are used and the recording, the embedding, and transmitting / receiving of a time scale is completed in the same message. As a result, when a transmitter-receiver two-way synchronizing algorithm is carried out in a network, the influences of six factors, including send time delay, access time delay, transmission time delay, propagation time delay, reception time delay, and receive time delay, are eliminated theoretically in a synchronizing process such that high synchronizing precision is obtained. Further, the method achieves self-adaptive skew compensation on this basis and verifies the algorithm in a ZigBee network experiment test. An acquired result complies with an expectation.

Description

technical field [0001] The invention relates to the field of wireless sensor networks, and more specifically, to a high-precision two-way time synchronization method for wireless sensor networks. Background technique [0002] Time synchronization technology is one of the key technologies of the Wireless Sensor Network (WSN), which provides a unified time measurement standard for the nodes of the entire network, and is the prerequisite and technical guarantee for the collaborative work of the entire network. Accurate time synchronization ensures the normal operation of network protocols, and also plays a key role in its actual application scenarios, such as node positioning, sleep scheduling, data fusion, TDMA scheduling, routing protocols, distance measurement, and data synchronization Wait, these applications all have clear requirements on the time synchronization of nodes in the network. [0003] Factors affecting time synchronization: In order to conduct more accurate re...

Claims

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Application Information

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IPC IPC(8): H04W56/00
CPCH04W56/00H04W56/0015H04W56/0055
Inventor 黄晓陈晓杰保延翔
Owner SUN YAT SEN UNIV
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