Design of proportional-integral observer for unknown input descriptor systems

@article{Koenig2002DesignOP,
  title={Design of proportional-integral observer for unknown input descriptor systems},
  author={Damien Koenig and Sa{\"i}d Mammar},
  journal={IEEE Trans. Automat. Contr.},
  year={2002},
  volume={47},
  pages={2057-2062}
}
This note presents simple methods to design fulland reducedorder proportional integral observer for unknown inputs (UI) descriptor systems. Sufficient conditions for the existence of the observer are given and proven. The observer is solvable by any pole placement algorithm, it achievesa posteriori robustness state and UI estimation versus to time varying parameters and bounded nonlinear UI. An illustrative example is included. 
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