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Instrumental variable methods for closed-loop system identification
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DOI：10.1016/j.automatica.2004.09.016.png)
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Abstract
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In this paper, several instrumental variable (IV) and instrumental variable-related methods for closed-loop system identification are considered and set in an extended IV framework. Extended IV methods require the appropriate choice of particular design variables, as the number and type of instrumental signals, data prefiltering and the choice of an appropriate norm of the extended IV-criterion. The optimal IV estimator achieves minimum variance, but requires the exact knowledge of the noise model. For the closed-loop situation several IV methods are put in an extended IV framework and characterized by different choices of design variables. Their variance properties are considered and illustrated with a simulation example. (C) 2004 Elsevier Ltd. All rights reserved.
Keywords:
closed-loop system identification
linear estimators
instrumental variables
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