A real-time synchronization method for wireless sensor networks based on mobile reference nodes
A wireless sensor and reference node technology, applied in synchronization devices, wireless communications, advanced technologies, etc., can solve problems such as unable to meet requirements, unable to obtain mobile reference point synchronization calibration services, etc., to reduce energy consumption and improve synchronization accuracy.
Active Publication Date: 2017-12-08
北京勇搏科技有限公司
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[0006] However, no matter how to adjust the value of △t, the sensor node cannot get the synchronization calibration service of the mobile reference point in the synchronization period of T+△t. When the sensor node has higher requirements for the clock accuracy in the synchronization period (T+△t), then unable to meet requirements
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[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. However, the examples given are not intended to limit the present invention.
[0055] Such as figure 1 As shown, the present invention provides a schematic flowchart of a real-time synchronization method for a wireless sensor network based on a mobile reference node,
[0056] Including: step S101, the wireless sensor node evaluates its own clock accuracy:
[0057] According to "A Clock Synchronization Method for Wireless Sensor Networks Based on Mobile Reference Nodes", the mobile reference node synchronizes the clock of the wireless sensor nodes with a cycle (T+△t), that is, the wireless sensor nodes are within the synchronization cycle (T+△t) time The resulting clock phase deviation μ 0 , assuming that the phase deviation of the clock changes linearl...
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Provided is a wireless sensor network real-time synchronization method based on a mobile reference node. The wireless sensor network real-time synchronization method comprises the following steps that after the clock precision of wireless sensor nodes is evaluated, whether clock synchronization is carried out or not is determined; the position of the mobile reference node is calculated according to the positions of the wireless sensor nodes; based on the paths from the wireless sensor nodes to wireless sensor node address information, the route of the wireless sensor nodes sending synchronous request information is set; if the clock precision of the wireless sensor node at the current moment cannot meet requirements, the wireless sensor nodes initiate synchronous requests to the mobile reference node; a dynamic multihop link from the wireless sensor nodes to the mobile reference node is formed in the transmitting process of the synchronous request information; after the mobile reference node receives the synchronous requests, the mobile reference node is in synchronous communication with the wireless sensor nodes on a return link in sequence; the wireless sensor nodes evaluate received synchronizing signals.
Description
technical field [0001] The invention relates to the technical field of wireless sensor networks, in particular to a real-time synchronization method for wireless sensor networks based on mobile reference nodes. Background technique [0002] Currently, mainstream algorithms for clock synchronization in sensor networks use reference nodes with fixed locations. Due to the limited communication range of wireless sensor nodes, even the communication range of reference nodes with strong communication capabilities cannot directly cover the entire wireless sensor network, so it must rely on multi-hop links formed by cluster head nodes or other intermediate nodes from the reference nodes To transmit synchronization information to the sensor nodes that need clock synchronization, so as to finally realize the clock synchronization of the whole network, it will inevitably require a large amount of communication as a whole, thus causing energy loss as an important performance index of wi...
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IPC IPC(8): H04W52/02H04W56/00
CPCY02D30/70
Inventor 何泾沙张玉强赵斌杨明欣徐晶
Owner 北京勇搏科技有限公司