Higher Order Statistical Analysis of Ocean Noise Measurements for Performance Prediction. First Analysis of SWellEX-3 Noise Characteristics.
Abstract
This report summarizes the first analysis of SWellEX-3 noise for nonstationarity and nonGaussianity. It in very important to understand these properties of the noise for the purpose of the design and performance analysis of various detection methods. A talk has been given on these results at the 130th International Meeting of the Acoustical Society of America, 27 Nov - 1 Dec 1995, in St. Louis, MO. The transparencies from the talk are in Appendix A of this report. In addition to the basic issues of characterizing the nonstationarity and nonGaussianity of the noise, it is also important to relate the noise characteristics to the shipping 'fingerprint' in the area, to the extent possible. Radar shiptrack data are available for the latter purpose. Rather than simply applying standard tests initially, very intuitive and graphical tests were designed to inform our understanding of the nature of the nonstationarity and nonGaussianity of the noise and to make clear which tests would be most appropriate and what other analysis might be necessary to raise our understanding to new levels. Significant nonstationarity and possibly nonGaussianity have been found, and these results are given in the following. It also appears that the nonstationarity may be frequency dependent in terms of the amount of changes in the moments occurring over time, and that the analysis will not be complete until moment sampling issues are studied and aliasing is ruled out.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1996
- Accession Number
- ADA307052
Entities
People
- George E. Ioup
- Juliette W. Ioup
- Lisa A. Pflug
- Pam M. Jackson
Organizations
- University of New Orleans