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Theses

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

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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Estelle Cherrier. Estimation de l'état et des entrées inconnues pour une classe de systèmes non linéaires. Ordinateur et société [cs.CY]. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL062N⟩. ⟨tel-01752761⟩

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