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Implantation d'une loi de commande. Application à la plate-forme de satellite de télécommunication eurostar 2000+

Abstract : The growing evolution of space activities relies on complex theoretical studies. The industrial systems, requiring more and more constraining robustness and performance specifications, a prospective study was initiated. The society MATRA MARCONI SPACE, submitted the problem of controller implementation of a finite word length for the satellite plateform EUROSTAR 2000+. The study linked to that plate-form is an excellent example to validate control laws. The current thesis deals first with reduced order problem of controller. A presentation stresses why balanced realizations, normalized coprime factorizations and frequency weighting are relevant in connection to the question. A new method based upon the coprime factors controller reduction and on the balanced realization with frequency weighting ensuring the closed loop stability is presented. The problems of using a discrete filter to approximate a continuous filter is investigated. Its application in a regulation loop is then dealt with. Eventually, the behaviour of discretized controller is studied. It takes into account of the fact that their "real" implementation is in finite word length. The different state space realizations based on the controller obtained during the initial continuous controller discretization are thus no more equivalent. So, the problem is then to find, from the Infinite state space realizations, the realization such that the affectation due ta truncation of finite word length implementation is minimized.
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Laurent Caramelle. Implantation d'une loi de commande. Application à la plate-forme de satellite de télécommunication eurostar 2000+. Autre. Université Henri Poincaré - Nancy 1, 1995. Français. ⟨NNT : 1995NAN10338⟩. ⟨tel-01748572⟩

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