The robust optimal control of uncertain systems-state space method

The robust optimal control of linear uncertain systems with L/sub 2/-bounded uncertainties is addressed. The optimal state feedback control law in the so-called worst disturbance case is derived. The LQL method, minimax state estimation-maximin state feedback closed loop control scheme (LQL means linear quadratic L/sub 2/-bounded uncertainties), is proposed. In a sense, the LQL method uses the idea of the linear-quadratic-Gaussian (LQG) method to treat H/sub infinity /-optimizing design problems.<
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