Open Access

Approximation of the Wigner Distribution for Dynamical Systems Governed by Differential Equations

EURASIP Journal on Advances in Signal Processing20022002:514609

DOI: 10.1155/S1110865702000458

Received: 31 July 2001

Published: 14 January 2002

Abstract

A conceptually new approximation method to study the time-frequency properties of dynamical systems characterized by linear ordinary differential equations is presented. We bypass solving the differential equation governing the motion by writing the exact Wigner distribution corresponding to the solution of the differential equation. The resulting equation is a partial differential equation in time and frequency. We then show how it lends itself to effective approximation methods because in the time frequency plane there is a high degree of localization of the signal. Numerical examples are given and compared to exact solutions.

Keywords

differential equations Wigner distribution time-frequency analysis

Authors’ Affiliations

(1)
Dipartimento di Elettronica, Politecnico di Torino
(2)
City University of New York

Copyright

© Galleani and Cohen 2002