Computes the single-sided power spectral density (PSD) of a univariate time series using the periodogram method. The periodogram method is a fast Fourier transform (FFT) based method that estimates the PSD. Wire data to the Xt input to determine the polymorphic instance to use or manually select the instance.


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TSA Periodogram Details

This VI computes the PSD of a time series using the periodogram method according to the following equation:

where S(f) is the PSD of the time series. df is the frequency interval, which is computed as fs/N. NBW is the noise power bandwidth of the window. N is the number of frequency bins. fs is the sampling rate. Before computing the PSD, this VI wraps the original time series Xt to an N-point series Xt'.

Examples

Refer to the following VIs for examples of using the TSA Periodogram VI:

  • Average PSD VI: labview\examples\Time Series Analysis\TSAGettingStarted
  • Beam Crack Detection VI: labview\examples\Time Series Analysis\TSAApplications
  • Power Spectral Density Estimation VI: labview\examples\Time Series Analysis\TSAGettingStarted