Abstract
This paper deals with the problem of disturbance rejection by dynamic measurement feedback. It aims at proposing new geometric characterizations for the fixed poles of this problem. We also propose solutions to the problem for which all the poles, except the fixed poles of the problem, are freely placed. These fixed poles are also characterized as some particular invariant zeros. As a corollary, we propose a necessary and sufficient condition for the existence of internally stable solutions, which generalizes the sufficient condition proposed by Basile and Marro.
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