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High-accuracy clock synchronization method of wireless sensor network

A technology of wireless sensors and high-precision clocks, applied in synchronization devices, wireless communications, electrical components, etc., can solve problems such as impossible maintenance, and achieve the effect of reducing costs

Active Publication Date: 2012-04-18
BEIJING AEROSPACE MEASUREMENT & CONTROL TECH
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  • Abstract
  • Description
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Problems solved by technology

In WSN applications, sensor nodes have strict requirements on power consumption, and they are required to maintain a small shape and low cost as much as possible so that they can be deployed in large quantities. The deployment environment is often a harsh environment that is difficult for ordinary people to access. Post-maintenance is usually not possible; obviously it is not advisable to use GPS and NTP for time synchronization of WSN

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  • High-accuracy clock synchronization method of wireless sensor network
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  • High-accuracy clock synchronization method of wireless sensor network

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Embodiment Construction

[0036] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0037] The invention provides a high-precision clock synchronization method of a wireless sensor network. In order to realize the method, the wireless sensor network is firstly configured. A GPS module is configured on each cluster head node.

[0038] figure 1 It is a schematic structural diagram of the wireless sensor network of the present invention, such as figure 1 As shown, the wireless sensor network includes host computer, Ethernet, gateway, cluster head node and sensor node. The host computer and the gateway are connected through Ethernet, the gateway is connected to each cluster head node in the wireless sensor network through the Wi-Fi wireless network, and each cluster head node is connected to the sensor nodes in the cluster through the Zigbee wireless network.

[0039] Different from the prior art, the cluster head node in the present inven...

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Abstract

The invention discloses a high-accuracy clock synchronization method of a wireless sensor network. An upper computer and a gateway in the wireless sensor network are connected through the Ethernet; the gateway is connected with each cluster head node in the wireless sensor network through a wireless fidelity (Wi-Fi) wireless network; the cluster head nodes are connected with sensor nodes through a Zigbee wireless network; during data sending and receiving of the cluster head nodes and the sensor nodes, the transmission time of data on a media access control (MAC) layer and a physical layer serves as accurate sending / receiving time; during synchronization, all cluster head nodes are synchronized by using a global positioning system (GPS) module, and then all sensor nodes in clusters are subjected to clock synchronization through the Zigbee wireless network by using the cluster head nodes; and the synchronization of the sensor nodes comprises clock offset synchronization and transmission delay synchronization between the cluster head nodes and the sensor nodes. By adoption of the method, cost and energy consumption can be reduced, and a synchronization process is simple to calculate.

Description

technical field [0001] The invention relates to the technical field of wireless sensor network synchronization, in particular to a high-precision clock synchronization method for a wireless sensor network. Background technique [0002] With the development of computer networks, more and more industrial fields have put forward higher requirements for clock synchronization, especially in most distributed control systems based on industrial Ethernet, microseconds have been proposed for clock synchronization Level synchronization requirements. [0003] Wireless sensor network (WSN) refers to an autonomous measurement and control network system that is composed of a large number of ubiquitous tiny sensor nodes with communication and computing capabilities densely distributed in the monitoring area and independently completes specified tasks according to the environment. [0004] Time synchronization is an important part of wireless sensor network applications. Sensor data fusion...

Claims

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Application Information

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IPC IPC(8): H04W56/00
CPCY02B60/50
Inventor 周庆飞王石记安佰岳周志波
Owner BEIJING AEROSPACE MEASUREMENT & CONTROL TECH
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