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Synchronization of a class of chaotic signals via robust observer design. (English) Zbl 1141.93314
Summary: The signal synchronization of a class of chaotic systems based on robust observer design is tackled. The task is the synchronization of the signals generated by two Chen oscillators with different initial condition. The proposed observer is robust against model uncertainties and noisy output measurements. An alternative system representation is proposed to transform the measured disturbance onto system disturbance, which leads a more adequate observer structure. The proposed methodology contains an uncertainty estimator based on the predictive contribution to infer the unobservable uncertainties and corrective contribution to estimate the observable uncertainties; which provides robustness against noisy measurements and model uncertainties. Convergence analysis of the proposed estimation methodology is realized, analyzing the dynamic equation of the estimation error, where asymptotic convergence is shown. Numerical experiments illustrate the good performance of the proposed methodology.
MSC:
93B07Observability
93C41Control problems with incomplete information
94A12Signal theory (characterization, reconstruction, filtering, etc.)
93C15Control systems governed by ODE
93C10Nonlinear control systems