Input-output-to-state stability for discrete-time systems

Authors:
Chaohong Cai;Andrew R. Teel
Affiliations:
Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106-9560, USA;Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106-9560, USA
Venue:
Automatica (Journal of IFAC)
Year:
2008

Citing 11
Cited 0

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Abstract

This paper presents Lyapunov characterizations of uniform output-to-state stability and uniform input-output-to-state stability (IOSS) (with respect to disturbances) for discrete-time (DT) nonlinear systems. We show the equivalence of the following three properties for DT systems: uniform IOSS, existence of a smooth Lyapunov function for uniform IOSS, and existence of a (state-)norm estimator. This equivalence result is a DT counterpart of Krichman et al. [2001. Input-output-to-state stability. SIAM Journal on Control and Optimization 39, 1874-1928. Theorem 2.4] and a generalization of Jiang and Wang [2002. A converse Lyapunov theorem for discrete-time systems with disturbances. Systems and Control Letters 45, 49-58. Theorem 1.1] and Jiand and Wang [2001. Input-to-state stability for discrete-time nonlinear systems. Automatica 37, 857-869. Theorem 1, 1@?4].