Wireless sensor network time synchronization method

Abstract

The invention provides a wireless sensor network time synchronization method which comprises the following steps that (1) after a central node is initialized, standard source second pulse time information received from standard source equipment is broadcast to terminal nodes in the whole network; after the terminal nodes are initialized, the standard source second pulse time information is received; then steps (2) and (3) are respectively executed to the central node and the terminal nodes; (2) the standard source second pulse of the central node predicts and self-calibrates so as to update the standard source pulse time, responds to the requests of the terminal nodes and broadcasts the updated standard source pulse time to the terminal nodes of the whole network; and (3) the terminal nodes self-wake up, predict and calibrate synchronously. According to the wireless sensor network time synchronization method, the vacant detection energy consumption of the terminal nodes can be effectively reduced, the time synchronization execution frequency of the terminal nodes is reduced, the sleeping time of the terminal nodes is increased, so that the synchronization precision is high, the interference of a user is not needed, good synchronization precision and energy-saving effect are realized, and the time synchronization requirements of the low power consumption and high precision of the wireless sensor network can be well met.

Description

technical field [0001] The invention relates to the technical field of wireless sensor networks, in particular to a time synchronization method for wireless sensor networks. Background technique [0002] Wireless Sensor Networks (WSN) is an ad hoc network composed of a large number of sensor nodes distributed in the monitoring area in the form of wireless communication. Through the mutual cooperation between nodes, various environmental information in the monitoring area are collected, processed, and fused, and transmitted to the base station through the main node route, so that users can perform operations such as viewing and controlling through satellites or the Internet. [0003] Wireless sensor network technology has broad application prospects and has been widely used in military, environment, biology, medical care, space exploration, climate monitoring, disaster relief and other fields. As an important supporting technology of wireless sensor network, time synchroniza...

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Problems solved by technology

[0007] However, in the above-mentioned inventive methods, the prediction results are used to correct their own logic time, and the synchronization accuracy is not high. At the same time, the nodes need to perform idle listening and a large number of calculations, which cannot effectively save the energy of the nodes. Can not well meet the special requirements of wireless sensor networks

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