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The Inverse Problem of Analytic Interpolation With Degree Constraint and Weight Selection for Control Synthesis

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3 Author(s)
Karlsson, J. ; Dept. of Math., R. Inst. of Technol., Stockholm, Sweden ; Georgiou, T.T. ; Lindquist, A.G.

The minimizers of certain weighted entropy functionals are the solutions to an analytic interpolation problem with a degree constraint, and all solutions to this interpolation problem arise in this way by a suitable choice of weights. Selecting appropriate weights is pertinent to feedback control synthesis, where interpolants represent closed-loop transfer functions. In this paper we consider the correspondence between weights and interpolants in order to systematize feedback control synthesis with a constraint on the degree. There are two basic issues that we address: we first characterize admissible shapes of minimizers by studying the corresponding inverse problem, and then we develop effective ways of shaping minimizers via suitable choices of weights. This leads to a new procedure for feedback control synthesis.

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Automatic Control, IEEE Transactions on  (Volume:55 ,  Issue: 2 )