Synchronous calibration method for real-time clocks of wireless sensor network and sensors

Abstract

The invention discloses a synchronous calibration method for real-time clocks of a wireless sensor network and sensors. The wireless sensor network comprises a plurality of sensors and sink nodes, wherein the sensors start communication at a communication time point; the sensors receive broadcast frames of the sink nodes to carry out real-time clock calibration before the communication time point. According to the method, the sensor nodes enter a dormant state in a time bucket without the service requirements, and then through increasing finite automatic wakeup, local synchronous calibration of the real-time clocks at the sensor nodes and the sink nodes is implemented, and the synchronous calibration of the clocks is considered while the low power consumption is achieved.

Description

technical field [0001] The invention relates to a real-time clock (Real-Time Clock, RTC for short) synchronous calibration method for wireless sensor networks, and also relates to corresponding sensors, belonging to the technical field of wireless sensor networks. Background technique [0002] Such as figure 1 As shown, a wireless sensor network usually includes sensor nodes, aggregation nodes and management nodes. A large number of sensor nodes are randomly deployed in or near the monitoring area, and can form a network through self-organization. The main components are sensor nodes integrating sensor modules, processor modules, wireless communication modules and energy supply modules. Each sensor node forms a distributed network through the protocol, and then the collected data is optimized and transmitted by radio waves. to the Information Processing Center. [0003] When sensor nodes implement various network protocols and application systems, there are also some prac...

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Problems solved by technology

However, it comes at the expense of increasing the price and volume of the sensor

[0009] In addition, the common disadvantage of the above two methods is that the real-time clock calibration for mass-produced sensors is too labor-intensive and material resources

Moreover, the above method basically only considers the influence of temperature on the real-time clock, and cannot fully consider various other factors of the environment where the sensor is located.

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