An industrial wireless sensor network clock frequency offset estimation method based on timing response

Abstract

The invention relates to an industrial wireless sensor network clock frequency offset estimation method based on timing response, and belongs to the technical field of wireless sensor networks. In themethod, the node to be synchronized sends a data packet to the reference node; the reference node receives the data packet; a corresponding timing response time is mapped according to the serial number of the data packet, a confirmation message is replied after the time interval, time stamp information does not need to be exchanged between the to-be-synchronized node and the reference node, and after multiple times of communication interaction, the to-be-synchronized node can estimate relative frequency offset and fixed time delay between node clocks. The method is easy to integrate into an industrial wireless sensor network with a time slot mechanism, a message special for time synchronization parameter estimation does not need to be sent and received independently, long-term tracking ofclock frequency offset can be achieved only with low calculation cost, communication expenditure is reduced, and energy consumption is reduced; Meanwhile, time stamps do not need to be interacted among the nodes, so that the safety of time synchronization parameter estimation is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, and relates to a method for estimating frequency offsets of timing response clocks suitable for industrial wireless sensor networks. Background technique [0002] The wireless sensor network consists of many sensor nodes that are spatially distributed, cheap, and tiny, and its computing, storage, and energy are all limited, and each node runs on its own independent clock. Due to the characteristics of flexible deployment and low cost, wireless sensor networks have been widely used in many fields, such as industrial fields. Traditional industrial networks mostly use wired connections, which limit their deployment flexibility and intelligent control of industrial processes. It is based on the advantages of wireless sensor network that industrial wireless sensor network came into being. Wireless micro sensor nodes are installed on many devices in the industrial field, responsible f...

AI Technical Summary

Problems solved by technology

Existing clock frequency offset estimation methods generally require special synchronization messages, and need to exchange time stamp information during transmission, resulting in large synchronization overhead

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