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Orthogonal Functions may be divided into two classes. The class of
continuous systems and the discontinuous class of piecewise
constant systems. Problems arise because continuous systems form an
unsatisfactory basis for the expansion of functions containing
discontinuities whilst piecewise constant systems insert artificial
discontinuities into all representations. Since these two classes
of functions would be unsuccessful in coping with functions that
possess both continuity and discontinuity we must look to General
Hybrid Orthogonal Functions (GHOF) which have been shown to be the
most appropriate in such situations. This book introduces the
system of GHOF, discusses its properties, develops an operational
algebra for the discretization of continuous dynamic systems on the
system of GHOF and illustrates its use as a flexible and powerful
framework of computational tools in a wide range of systems and
control.
Models of dynamical systems are required for various purposes in
the field of systems and control. The models are handled either in
discrete time (DT) or in continuous time (CT). Physical systems
give rise to models only in CT because they are based on physical
laws which are invariably in CT. In system identification, indirect
methods provide DT models which are then converted into CT. Methods
of directly identifying CT models are preferred to the indirect
methods for various reasons. The direct methods involve a primary
stage of signal processing, followed by a secondary stage of
parameter estimation. In the primary stage, the measured signals
are processed by a general linear dynamic operation-computational
or realized through prefilters, to preserve the system parameters
in their native CT form-and the literature is rich on this aspect.
In this book: Identification of Continuous-Time Systems-Linear and
Robust Parameter Estimation, Allamaraju Subrahmanyam and Ganti
Prasada Rao consider CT system models that are linear in their
unknown parameters and propose robust methods of estimation. This
book complements the existing literature on the identification of
CT systems by enhancing the secondary stage through linear and
robust estimation. In this book, the authors provide an overview of
CT system identification, consider Markov-parameter models and
time-moment models as simple linear-in-parameters models for CT
system identification, bring them into mainstream model
parameterization via basis functions, present a methodology to
robustify the recursive least squares algorithm for parameter
estimation of linear regression models, suggest a simple off-line
error quantification scheme to show that it is possible to quantify
error even in the absence of informative priors, and indicate some
directions for further research. This modest volume is intended to
be a useful addition to the literature on identifying CT systems.
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