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Extensions of sliding-mode adaptive observer are presented for state reconstruction of nonlinear systems with uncertainty having unknown bounds. The observer uses nonlinear gains that are smoothened versions of classical sliding-mode gains and they are continuously updated to guarantee a globally stable observation error. This observer is applied to Chua's(More)
A general clsss of dwxete-time uncertam nonlinear stochastic systems corrupted by finite energy dssturbances and estimation performance crlterla are considered These performance criteria include guaranteed-cost suboptimal versions of estimation obJectives hke HZ, H,, stochsstlc passwlty, etc Smear state estimators that sat&y these crlterla are presented A(More)
A novel state dependent control approach for discrete-time nonlinear systems with general performance criteria is presented. This controller is robust for unstructured model uncertainties, resilient against bounded feedback control gain perturbations in achieving optimality for general performance criteria to secure quadratic optimality with inherent(More)