State and input simultaneous estimation for a class of nonlinear systems

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Journal Article
Automatica, 2004, 40 (10), pp. 1779 - 1785
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This paper addresses the problem of estimating simultaneously the state and input of a class of nonlinear systems. Here, the systems nonlinear part comprises a Lipschitz nonlinear function with respect to the state and input, and a state-dependent unknown function including additive disturbance as well as uncertain/nonlinear/time-varying terms. Upon satisfying some conditions, the observer design problem can be solved via a Riccati inequality or a LMI-based technique with asymptotic estimation guaranteed. A numerical example is included for illustration. © 2004 Elsevier Ltd. All rights reserved.
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