A Time Synchronization Method Between Nodes in Wireless Sensor Networks

Abstract

The invention provides a time synchronization method between wireless sensor network nodes. The steps are as follows: the wireless sensor periodically sends a heartbeat packet with a time stamp to the parent node, obtains the time difference between the local time of the terminal node and the parent node, and stores it in the Circular queue to obtain the mean value of the time difference between the local time of the terminal node and the parent node and the time difference of related nodes; when the vehicle passes through two adjacent sensor nodes in the same lane, the sensor node records the trigger time of the geomagnetic sensor and sends it to the parent node; the parent node obtains the same value. The triggering time difference of two adjacent sensor nodes in the lane is subtracted from the time difference of related nodes to obtain the time required for the vehicle to pass through two adjacent sensor nodes in the same lane, and the vehicle speed is obtained; the parent node transmits the processing result to the processing center. Through the time synchronization method between wireless sensor network nodes provided by the present invention, high-precision time synchronization between related wireless sensor nodes is realized, the workload of terminal nodes is reduced, and the battery life time is prolonged.

Description

technical field [0001] The invention relates to a time synchronization method between nodes of a wireless sensor network, in particular to a method for realizing time synchronization between low-power and high-precision terminal nodes, and belongs to the technical field of wireless sensor networks. Background technique [0002] Intelligent Transportation System (ITS--Intelligent Transportation System) integrates computer technology, information transmission processing technology and automatic control technology. Wireless geomagnetic sensors can be widely used in intelligent transportation fields such as traffic data collection and assistance in traffic guidance. The equipment required to complete traffic data collection using geomagnetic vehicle detection technology includes a geomagnetic vehicle flow detection unit (wireless sensor node), a geomagnetic vehicle flow transmission repeater, a geomagnetic vehicle flow detection receiving host (also called a gateway), and a data ...

AI Technical Summary

Problems solved by technology

Due to the limited resources of sensor nodes, limited energy, uncertain network load and other factors, many mature wireless sensor network (WSN) time synchronization algorithms, such as DTMS, RBS, TPSN, LTS and other synchronization algorithms, are not suitable for geomagnetic vehicles. Detecting Wireless Sensor Networks

Some of these algorithms are complex, requiring strong computing power and more resources; The impact of load, uncertainty of packet transmission delay, unpredictable data transmission delay, and many factors affecting the uncertainty of time synchronization

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