ℋ∞ filtering and smoothing for linear discrete time-varying descriptor systems with unknown inputs
ℋ∞ filtering and smoothing for linear discrete time-varying descriptor systems with unknown inputs
- Author(s): H. Zhao ; C. Zhang ; G. Xing
- DOI: 10.1049/iet-cta.2010.0565
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- Author(s): H. Zhao 1 ; C. Zhang 1 ; G. Xing 1
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View affiliations
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Affiliations:
1: School of Control Science and Engineering, Shandong University, Jinan, People’s Republic of China
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Affiliations:
1: School of Control Science and Engineering, Shandong University, Jinan, People’s Republic of China
- Source:
Volume 6, Issue 5,
15 March 2012,
p.
734 – 743
DOI: 10.1049/iet-cta.2010.0565 , Print ISSN 1751-8644, Online ISSN 1751-8652
This study is concerned with the finite horizon ℋ∞ filtering and smoothing problems for linear discrete time-varying descriptor (LDTVD) systems with unknown inputs (UI). Under the condition of Y-observability, the LDTVD system is transformed into a non-descriptor system. The design of ℋ∞ filter and smoother is equivalent to a positivity problem of a certain indefinite quadratic form. By relating this quadratic form to a Krein space state-space model, the Kalman filter theory and the innovation analysis technology are adopted to solve the formulated ℋ∞ estimation problem. A necessary and sufficient condition for solvability of the estimation problem is proposed, and the simultaneous state and UI estimator is obtained in terms of algebraic Riccati equations. Numerical examples are provided to illustrate the performance of the ℋ∞ filter and smoother.
Inspec keywords: state-space methods; Kalman filters; estimation theory; computability; time-varying systems; H∞ filters; observability; smoothing methods; discrete time systems
Other keywords:
Subjects: Time-varying control systems; Discrete control systems; Control system analysis and synthesis methods
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