Functional Controllability, Functional Stabilisability, and the Generalised Separation Principle
This paper introduces the new concepts of Functional Controllability and Functional Stabilisability, and establishes their duality with Functional Observability and Functional Detectability, respectively. We further present a Generalised Separation Principle, demonstrating that the classical Separation Principle emerges as a special case. Conditions for the existence of functional controllers of a specified order are derived. Importantly, the design framework does not require full controllability. Furthermore, we develop a functional observer-based controller design applicable to systems that are both uncontrollable and unobservable. The results presented generalise the classical full-state feedback control paradigm.
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