Accession Number : ADA307052

Title :   Higher Order Statistical Analysis of Ocean Noise Measurements for Performance Prediction. First Analysis of SWellEX-3 Noise Characteristics.

Descriptive Note : Technical rept. 22 Feb 95-21 Feb 96,

Corporate Author : NEW ORLEANS UNIV LA DEPT OF PHYSICS

Personal Author(s) : Ioup, George E. ; Ioup, Juliette W. ; Pflug, Lisa A. ; Jackson, Pam M.

PDF Url : ADA307052

Report Date : FEB 1996

Pagination or Media Count : 34

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.

Descriptors :   *RADAR, *OCEAN SURVEILLANCE, MEASUREMENT, METHODOLOGY, DETECTION, STANDARDIZATION, STATISTICAL ANALYSIS, WATER TRAFFIC, SHIPPING, NOISE(RADAR).

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE