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. Dans-une-première-partie, une nouvelle forme d'observateurs dynamiques H ? est conçue pour les systèmes linéaires en présence d'entrées inconnues et de perturbations, pour les systèmes continus et discrets. L'observateur proposé généralise ceux existants tels que les observateurs proportionnels et proportionnels-intégrales

. Ensuite, ces observateurs ont été utilisés dans la synthèse de contrôleurs basés observateur pour les systèmes incertains en présence de perturbations. Cette synthèse est basée sur le paramétrage des solutions des contraintes algébriques obtenues à partir des erreurs d'estimation. La solution est obtenue à partir de la résolution des inégalités matricielles bilinéaires en

. Dans-la-dernière-partie, les résultats obtenus ont été étendus aux systèmes de grande dimension. Dans ce cadre, les systèmes considérés sont décomposés en plusieurs sous systèmes interconnectés de faible dimension