A modified method for closed-loop identification of transfer function models

Author

Zheng, Wei Xing

Author_Institution

Sch. of Quantitative Methods & Math. Sci., Univ. of Western Sydney, Penrith South DC, NSW, Australia

Volume

49

Issue

4

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

556

Lastpage

562

Abstract

Substantial revisions on the newly proposed bias correction based method are made in the framework of indirect identification of a linear (possibly unstable) plant operating in closed loop with a low-order stabilizing controller. By making a new formulation of a least-squares estimate of an intermediate parameter vector purposely introduced, the modified algorithm is able to achieve a direct yet unbiased closed-loop system estimate in the presence of misspecified noise model. With no identification of a high-order augmented closed-loop system, the computational complexity of the algorithm is significantly reduced. Simulations of identifying an open-loop unstable plant illustrate the promising performance of the modified algorithm in low signal-to-noise ratio environments

Keywords

closed loop systems; control system synthesis; feedback; identification; least squares approximations; parameter estimation; transfer functions; bias correction based method; closed-loop identification; closed-loop system estimation; computational complexity reduction; control systems design; indirect identification; intermediate parameter vector; least-squares estimate; linear plant; low SNR environments; low signal-to-noise ratio environments; low-order stabilizing controller; misspecified noise model; modified algorithm; parameter estimation; transfer function models; unstable plant; Australia; Computational complexity; Computational modeling; Control systems; Instruments; Open loop systems; Parameter estimation; Transfer functions; Vectors; Working environment noise;

fLanguage

English

Journal_Title

Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on

Publisher

ieee

ISSN

1057-7122

Type

jour

DOI

10.1109/81.995678

Filename

995678