Robust H/sup infinity / control design for systems with structured parameter uncertainty

In a recent paper a unification of the L/sub 2/ (LQG) and H/sup infinity / control design problems was obtained in terms of modified algebraic Riccati equations. In this study these results are extended to guarantee robust L/sub 2/ and H/sup infinity / performance in the presence of structured real-valued parameter variations in the state-space model. For design flexibility the authors consider two distinct types of uncertainty bounds, for both full- and reduced-order dynamic compensation. An important special case of these results generates L/sub 2//H/sup infinity / controller designs with guaranteed gain margins.<
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