Two Schemes of Data Dropout Compensation for LQG Control of Networked Control Systems

This paper investigates the LQG control problem for networked control systems (NCSs) with packet losses, where the packet losses are considered to appear in both the sensor‐to‐controller channel and controller‐to‐actuator channel. Bernoulli random processes are used to describe the packet losses in...

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Bibliographic Details
Published in:Asian journal of control 2015-01, Vol.17 (1), p.55-63
Main Authors: Gao, Jinfeng, Wu, Han, Fu, Minyue
Format: Article
Language:English
Subjects:
Computer networks
Computer science
Control systems
Kalman filter
LQG
networked control systems
optimal control
packet dropout
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Summary:This paper investigates the LQG control problem for networked control systems (NCSs) with packet losses, where the packet losses are considered to appear in both the sensor‐to‐controller channel and controller‐to‐actuator channel. Bernoulli random processes are used to describe the packet losses in the two channels. Two simple compensation schemes are explored for state estimation with missing measurements in which the input of the plant is set to zero if a packet is lost, and the hold‐input strategy, in which the previous input is used with packet dropout. The optimal static controller gains and the critical loss probabilities for the two schemes are presented, and their performances are compared in terms of numerical simulations. The conclusion is that neither of the two schemes can be claimed to be superior to the other, as the stability regions of the two strategies are reversely complemented to each other whether for the scalar or vector example.
ISSN:1561-8625
1934-6093
DOI:10.1002/asjc.1045