Loop Transfer Recovery (LTR) is part of the Communications and
Control Engineering Series (CCES) edited by Professors B.W. Dickinson,
E.D. Sontag, M. Thoma, A. Fettweis, J.L. Massey and J.W. Modestino.
Loop Transfer Recovery deals with several issues of analysis and
design of the Loop Transfer Recovery (LTR) problem. It discusses when
and how an LTR is possible and outlines different controller structures
and the available design freedom. An explanation of the actual design
methods for accomplishing an LTR is given. Besides dealing with observer
based measurement feedback controllers, which are commonly used for LTR,
a new controller with a different architecture which out performs
observer based controllers is presented. This publication will be of
benefit to anyone who has completed a first graduate course in linear
systems and state-space methods, together with an elementary knowledge
of Linear Quadratic Control.