Title :
Interpolated smoothed pseudo Wigner-Ville distribution for accurate spectrum analysis
Author :
Andria, Gregorio ; Savino, Mario
Author_Institution :
Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, Italy
fDate :
8/1/1996 12:00:00 AM
Abstract :
This paper deals with a new application of the time-domain windowed (smoothed version) of the pseudo Wigner-Ville distribution (PWD), that can be easily implemented in a dedicate digital instrument to be used as a spectral analyzer for time-frequency analysis of nonstationary signals. New computational algorithms are studied and developed to attain high time-frequency resolution, accuracy, flexibility and computational efficiency. Particularly, to reduce the negative effects due to leakage during frequency changes, a new interpolation formula is derived by using the windowing theory. The suggested technique allows the users to perform optimal evaluations of the instantaneous amplitudes and frequencies of analyzed signals
Keywords :
Wigner distribution; interpolation; signal processing; spectral analysis; statistical analysis; accuracy; computational algorithms; computational efficiency; digital instrument; flexibility; frequency changes; instantaneous amplitudes; instantaneous frequencies; interpolation; leakage; negative effects; nonstationary signals; optimal evaluations; signal analysis; smoothed pseudo Wigner-Ville distribution; spectral analyzer; spectrum analysis; time-domain windowed distribution; time-frequency analysis; time-frequency resolution; windowing theory; Computational efficiency; Instruments; Interpolation; Performance analysis; Performance evaluation; Signal analysis; Signal resolution; Spectral analysis; Time domain analysis; Time frequency analysis;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on