On observer for a class of uncertain nonlinear systems
Nonlinear Dynamics, Volume 79, No. 1, Year 2015
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This paper considers the problem of estimating the unmeasurable states for a family of uncertain nonlinear systems. For systems with bounded trajectories, we propose a weak practical observer (see Definition 1). When the trajectories are unbounded, under the assumption that the nonlinearity is bounded, we construct a global time-varying observer. Finally, an example is provided to verify the effectiveness of the observer.