This letter deals with the discrete approximation of the fractional-order differentiator s^0.5. The proposed approach is based on the efficient continued fraction approximation of the operator. The discrete differentiator is expressed as a z-transfer function, whose coefficients are given in closed form in terms of the sampling time and an approximation parameter. Simulation experiments show the efficiency of the approximation with low-order z-transfer functions.
|Autori interni:||MAIONE, Guido|
|Titolo:||A Rational Discrete Approximation to the Operator s^0.5|
|Rivista:||IEEE SIGNAL PROCESSING LETTERS|
|Data di pubblicazione:||2006|
|Digital Object Identifier (DOI):||10.1109/LSP.2005.862615|
|Appare nelle tipologie:||1.1 Articolo in rivista|