An Unknown Input Observer for Singular Time-Delay Systems

@article{Perdon2006AnUI,
  title={An Unknown Input Observer for Singular Time-Delay Systems},
  author={A. M. Perdon and Maria Anderlucci},
  journal={2006 14th Mediterranean Conference on Control and Automation},
  year={2006},
  pages={1-6}
}
The problem of state reconstruction is discussed for linear singular systems with a finite number of commensurable point delays using as models systems with coefficients in a ring. A geometric notion of conditioned invariant submodule is introduced for this class of systems over a ring and a design procedure is presented for constructing an observer in presence of unknown inputs 

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