An SPWD-based instrument for accurate spectral analyses

The Wigner-Ville distribution (WD) is particularly used for time-frequency analysis of non-stationary signals. This paper proposes the application of the smoothed version of the WD to design an innovative virtual instrument (VI) which can be used as a spectral analyzer. Our work focuses on the computational algorithms that meet several essential requirements for implementation, such as high time-frequency resolution, precision, flexibility, and computational efficiency. An original interpolation formula is derived, to overcome the negative effects due to leakage. Following this, a simple WD implementation on the designed VI is proposed and a series of numerical checks is shown, to suitably characterize the new instrument