Inproceedings,

State Observer Design for Networked Control Systems with Unknown Disturbances

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18th IFAC World Congress, 18, page 8805--8810. Milano, Italy, (2011)
DOI: 10.3182/20110828-6-IT-1002.00456

Abstract

In this work, the design of an observer for systems whose output measurements are acquired through a network is addressed. The measurements are assumed to scarcely available, and arriving randomly on time. The noises of the measurement devices are assumed to be known, but the system disturbances are not. A new parameter that can be calculated on line and that measures the relationship between noise measurement and the output estimation error is defined. This parameter is related to the unknown disturbance and, hence, an observer depending on that parameter is defined. A parametric optimization problem is stated for the observer design, leading to an stable observer that minimizes the effect of both the noise and the unknown disturbance. The proposed approach is compared with the Kalman filter approach under the assumption of known and unknown disturbances, showing the validity of the approach.

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