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Timestamp-free synchronous clock parameter tracking method based on extended Kalman filtering

A technology for extending Kalman and synchronizing clocks, applied in synchronizing devices, complex mathematical operations, digital technology networks, etc., can solve the problem of not realizing the estimation of clock instantaneous offset parameters, restricting free time stamps, etc., to reduce energy consumption , avoid waste, reduce the effect of frequency

Active Publication Date: 2021-09-24
CHONGQING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current timestamp-free synchronization methods are designed based on the assumption that the clock skew parameters remain unchanged. However, due to factors such as the external environment and the life of the crystal oscillator itself, the clock skew of wireless sensor nodes will show nonlinear time-varying. Although there are schemes that can track the clock skew parameters of time-stamp-free synchronization, they fail to realize the estimation of clock instantaneous skew parameters, which restricts the application of time-stamp-free synchronization in practical wireless sensor networks.

Method used

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  • Timestamp-free synchronous clock parameter tracking method based on extended Kalman filtering
  • Timestamp-free synchronous clock parameter tracking method based on extended Kalman filtering
  • Timestamp-free synchronous clock parameter tracking method based on extended Kalman filtering

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Embodiment

[0118] figure 2 It is a flow chart of a method for tracking parameters of time-varying clocks synchronously without time stamp provided by an embodiment of the present invention. This embodiment provides a joint tracking method of clock skew and clock instantaneous offset based on the extended Kalman filter method for sensor nodes that perform timestamp-free interaction, such as figure 2 As shown, it specifically includes the following steps:

[0119] D1: The clock parameter tracking process starts;

[0120] D2: Extended Kalman filter initialization;

[0121] D3: Time stamp-free interaction between the node to be synchronized and the reference clock node, and record the time when it sends and receives data packets;

[0122] D4: Determine whether the synchronization round is an odd number, if it is an odd number, enter the process D5, otherwise enter the process D6;

[0123] D5: Increase the number of synchronization rounds by 1, and enter the process D3;

[0124] D6: Th...

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Abstract

The invention relates to a timestamp-free synchronous clock parameter tracking method based on extended Kalman filtering, and belongs to the technical field of wireless sensor networks. A first-order Gaussian Markov model and a clock model are used as state equations to describe the evolution process of clock skew and clock instantaneous offset. An observation equation formed by a timestamp-free synchronization and clock instantaneous offset observation model is established, and the clock skew and clock instantaneous offset are jointly tracked by using a tracking method based on extended Kalman filtering to realize synchronization between the node to be synchronized and the reference clock node. According to the method, simultaneous tracking of the two time-varying parameters can be completed by following the network data flow, a special synchronization frame is not needed to interact synchronization information, the energy consumption is reduced, and the synchronization precision is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, and relates to a time stamp-free synchronization clock parameter tracking method based on extended Kalman filtering. Background technique [0002] Due to its advantages of low power consumption, easy deployment and low price, wireless sensor networks are widely used, such as object tracking, data fusion and deterministic scheduling. These applications require the nodes in the network to run on a common time base, so time synchronization technology is an important supporting technology for wireless sensor networks. [0003] Timestamp-free synchronization is a low-power synchronization mechanism that can achieve synchronization between nodes without interactive timestamps. Because time information is not transmitted during the synchronization process, and the synchronization function is easy to embed into the network data stream, this type of synchronization mechanism has received...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06H04W56/00G06K9/62G06F17/11G06F17/16H03H17/02H04W84/18
CPCH04J3/0638H04W56/0015G06F17/11G06F17/16H03H17/0257H04W84/18G06F18/295Y02D30/70G06F1/12
Inventor 王恒彭政岑鲁锐郭曦王平
Owner CHONGQING UNIV OF POSTS & TELECOMM
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