Title :
On the use of the warblet transform for instantaneous frequency estimation
Author :
Angrisani, L. ; D´Arco, Mauro ; Moriello, Rosario Schiano Lo ; Vadursi, Michele
Author_Institution :
Dipt. di Informatica e Sistemistica, Universita di Napoli Federico II, Italy
Abstract :
A new digital signal-processing method for instantaneous frequency estimation is here proposed. The attention is mainly paid to signals whose instantaneous frequency trajectories exhibit a periodic evolution versus time. Thanks to an optimized use of the warblet transform, the method assures superior accuracy and resolving capability with respect to other solutions already available in the literature, thus showing itself very attractive in the presence of multicomponent signals characterized by instantaneous frequency trajectories extremely similar and very close to one another. Theoretical notes regarding the warblet transform and its optimized use in the framework of the proposed method are first given. Then, the fundamental steps of the method are described in detail with references to a clarifying example. The results of a number of experiments on emulated and actual signals, aimed at assessing the performance of the method, are finally presented.
Keywords :
frequency estimation; signal representation; time-frequency analysis; transforms; chirplet transform; digital signal-processing method; instantaneous frequency estimation; monocomponent signal analysis; multicomponent signals; signal instantaneous frequency trajectory; time-frequency representations; warblet transform; Chirp; Communication industry; Frequency estimation; Industrial power systems; Optimization methods; Polynomials; Signal analysis; Signal resolution; System testing; Time frequency analysis;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2004. IMTC 04. Proceedings of the 21st IEEE
Print_ISBN :
0-7803-8248-X
DOI :
10.1109/IMTC.2004.1351216