Nonlinear Dynamics

, Volume 79, Issue 1, pp 359–368 | Cite as

On observer for a class of uncertain nonlinear systems

Original Paper


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.


Uncertain nonlinear systems Unknown parameters Observers Practical observers 


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.ESST, Hammam SousseSousseTunisia
  2. 2.Department of MathematicsCollege of Applied SciencesMeccaKSA
  3. 3.Department of Mathematics, Faculty of Sciences of GabèsUniversity of GabèsGabèsTunisia

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