Bispectral Analysis of Ocean Acoustic Noise Processes

date March 12, 1986
comments no comments.

Wednesday, March 12, 1986 4:00 p.m.

Gary R. Wilson
Applied Research Laboratories
The University of Texas at Austin

Although spectral analysis of time series is a useful tool in many areas, it has generally been limited to the power spectrum. The less commonly employed higher-order spectra (polyspectra) contain information about the time series that cannot be obtained from the power spectrum. The bispectrum, the next higher-order spectrum above the power spectrum, may be used to determine whether a time series is nonlinear or non-Gaussian. Recently, the application of bispectral analysis to ocean acoustic noise processes has demonstrated that in some cases ocean acoustic noise is nonlinear. In this seminar, the theory of polyspectra will be reviewed, and the results of a bispectral analysis of ocean acoustic noise will be discussed.