NDLI: An Estimation Algorithm for a Class of Networked Control Systems Using UDP-Like Communication Schemes

Content Provider	IEEE Xplore Digital Library
Author	Epstein, M. Ling Shi Murray, R.M.
Copyright Year	2006
Description	Author affiliation: Control & Dynamical Syst., California Inst. of Technol., Pasadena, CA (Epstein, M.; Ling Shi; Murray, R.M.)
Abstract	In this work we consider a class of networked control systems (NCS) when the control signal is sent to the plant via a UDP-like communication protocol. In this case the controller sends a communication packet to the plant across a lossy network, but the controller does not receive any acknowledgement signal indicating the status of the control packet. Standard observer based estimators assume the estimator has knowledge of what control signal is applied to the plant. Under the UDP-like protocol the controller/estimator does not have explicit knowledge whether the control signals have been applied to the plant or not. We present a simple estimation and control algorithm that consists of a state and mode observer as well as a constraint on the control signal sent to the plant. For the class of systems considered, discrete time LTI plants where at least one of the states that is directly affected by the input is also part of the measurement vector, the estimator is able to recover the fate of the control packet from the measurement at the next timestep and exhibit better performance than other naive schemes. For single-input-single-output (SISO) systems we are able to show convergence properties of the estimation error and closed loop stability. Simulations are provided to demonstrate the algorithm and show its effectiveness
Starting Page	5597
Ending Page	5603
File Size	7595845
Page Count	7
File Format	PDF
ISBN	1424401712
DOI	10.1109/CDC.2006.377481
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-12-13
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Networked control systems Communication system control Control systems Protocols State estimation Time measurement Observers Convergence Estimation error Stability
Content Type	Text
Resource Type	Article

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