Journal
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
Volume 47, Issue 5, Pages 837-841Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAC.2002.1000283
Keywords
approximation; filter synthesis; fractional differentiation; frequency-domain method; model reduction; system identification; Viete root functions
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This note proposes a noniterative method to fit a rational transfer function to a specified frequency response. A method using a smoothing of width-modulated pulses of the phase asymptotic-diagram is modified to provide an exact algebraic method. This is then used to synthesize a robust controller and a nonrational transfer function with a fractional differentiation order.
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