Voltage self-adaption wireless sensor network time synchronization method

Abstract

The invention discloses a wireless sensor network time synchronization method based on voltage sensing. The wireless sensor network time synchronization method comprises steps of external clock synchronization and local time self-correction. During the frequency offset estimation process, the influence of the current working voltage change of a node on node frequency offset is considered, and the frequency offset estimation precision is improved. At the same time, the algorithm mainly depends on local information during the time synchronization process, information transmission number of times is greatly reduced, energy consumption is greatly reduced, and error accumulation brought by information layer-by-layer transmission is reduced. Finally, the algorithm has low dependence on information transmission, and the problem that communication is stable due to the dynamic change of the voltage and the node position and the like is solved.

Description

technical field [0001] The invention relates to the technical field of wireless networks, in particular to a voltage adaptive wireless sensor network time synchronization method, which is suitable for large-scale regional monitoring wireless sensor network applications such as wild animal monitoring and earthen site monitoring. Background technique [0002] As an important supporting technology of wireless sensor networks, time synchronization has been widely used, such as data fusion technology, sleep scheduling technology, TOA-based positioning technology and target tracking, all of which require the nodes of the entire network to maintain time synchronization. In a large-scale sensor network, there are many network nodes, and the energy, processing power, and bandwidth of the nodes are relatively limited, and the network environment is relatively harsh. Therefore, this requires the sensor network time synchronization algorithm to have low communication overhead, low comput...

AI Technical Summary

Problems solved by technology

There are three defects in this method: 1) Since this method uses frequent timestamp exchange for time synchronization, it will introduce a large amount of communication overhead

The shortcomings of this method are: 1) There are certain restrictions on the environment, and this type of method is not applicable to the field environment where various signals cannot reach

Moreover, the method of synchronizing according to fluorescent lamps requires that the sensor network must work in an indoor environment; 2) WIFI signals and broadcast signals require additional hardware devices to receive them. Large-scale deployment; 3) This method also does not take into account the impact of the working environment on cheap crystal oscillators

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