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Residual Models and Stochastic Realization in State-Space Identification

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Author

Summary, in English

This paper presents theory and algorithms for validation in system identification of state-space models from finite input-output sequences in a subspace model identification framework. Our formulation includes the problem of rank-deficient residual covariance matrices, a case which is encountered in applications with mixed stochastic-deterministic input-output properties as well as for cases where outputs are linearly dependent. Similar to the case of prediction-error identification, it is shown that the resulting model can be decomposed into an input-output model and a stochastic innovations model. Using the Riccati equation, we have designed a procedure to provide a reduced-order stochastic model that is minimal with respect to system order as well as the number of stochastic inputs thereby avoiding several problems appearing in standard application of stochastic realization to the model validation problem.

Publishing year

2001

Language

English

Pages

988-995

Publication/Series

International Journal of Control

Volume

74

Issue

10

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Control Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 0020-7179