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Estimation de l'état et des entrées inconnues pour une classe de systèmes non linéaires

Estelle Cherrier 1
1 Monétique & Biométrie
CRAN - Centre de Recherche en Automatique de Nancy
Abstract : In a general way, this thesis deals with state and unknown input estimation for a class of nonlinear systems. In a more particular way, the problem is addressed from a secure communication system design point of view, based on chaotic systems properties and synchronization ability. Our work deals with three main points: selection of the transmitter, design of the receiver, and development of the information (or message) transmission process.
The chosen transmitter is a time-delay nonlinear chaotic system: the main reason is that a very complex behavior is brought about by the delayed state feedback. The receiver design relies on a nonlinear observer synthesis, whose stability and convergence ensure synchronization with the transmitter. The message insertion is realized through a chaotic carrier phase modulation. The decryption process is similar to an unknown input recovery, at the receiver side.
The security of the proposed encryption/decryption process is studied using standard cryptanalysis techniques. Chaotic multimodels are defined to tighten up the synchronization process security.
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Submitted on : Tuesday, December 5, 2006 - 3:01:35 PM
Last modification on : Friday, October 23, 2020 - 8:38:05 AM
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Estelle Cherrier. Estimation de l'état et des entrées inconnues pour une classe de systèmes non linéaires. Automatique / Robotique. Institut National Polytechnique de Lorraine - INPL, 2006. Français. ⟨tel-00118483⟩

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