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Fast computation of achievable feedback performance in mixed sensitivity H^{\infty } design

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2 Author(s)
Jonckheere, E.A. ; University of Southern California, Los Angeles, CA, USA ; Juang, J.-C.

The computational bottleneck of theH^{infty}design has been recognized to be the "ε-iteration," a computationally demanding direct search of the minimum achievableH^{infty}performance. Verma and Jonckheere showed that the optimalH^{infty}performance can be characterized as the spectral radius of the so-called "Toeplitz plus Hankel" operator. Even before the appearance of the "Toeplitz plus Hankel" operator in theH^{infty}setting, the same operator had already been shown to play a crucial role in the spectral theory of the linear-quadratic problem developed by Jonckheere and Silverman. In this paper, we exploit this common "Toeplitz plus Hankel" operator structure shared by the seemingly unrelated linear-quadratic andH^{infty}problems, and we construct fast state-space algorithms for evaluating the spectral radius of the "Toeplitz plus Hankel" operator. The salient feature of the algorithm is that the spectral radius can be evaluated, with an accuracy predicted by an identifiable error bound, from the antistabilizing solution of the algebraic Riccati equation of the linear-quadratic problem associated with theHinftydesign.

Published in:

Automatic Control, IEEE Transactions on  (Volume:32 ,  Issue: 10 )

Date of Publication:

Oct 1987

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