Abstract
This paper proposes a design technique of a subopti-mal observer-based controller for linear discrete-time systems with inaccessible states. Attention is focused on the case when the initial conditions are completely unknown. The performance criterion of interest is the standard quadratic one. An upper bound on the degradation in performance, due to absence of state, is developed and expressed as the Probenius norm of a symmetric positive definite matrix. Minimization of this bound produces the observer parameters. Computer-aided algorithms for arriving at the optimizing solution are given.
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