Accession Number:

ADA231766

Title:

Three Dimensional Noise Field Estimation from Horizontal Line Arrays

Descriptive Note:

Rept. for 7-9 Feb 1990

Corporate Author:

NAVAL OCEANOGRAPHIC AND ATMOSPHERIC RESEARCH LAB STENNIS SPACE CENTER MS

Report Date:

1991-02-09

Pagination or Media Count:

8.0

Abstract:

A technique to estimate the three dimensional 3-D character of the undersea ambient noise filed with the use of a horizontal line array as the measurement tool has been developed. Horizontal line array beam noise data, on several array headings, and knowledge of the arrays 3-D beam response patterns were used as an input into the 3-D noise filed estimation technique. The final product indicates that the resulting 3-D field estimate can be used to determine both the horizontal and vertical directionality of the noise field. Furthermore, having an estimate of the 3-D noise field facilitates other investigations of the noise field that are normally not possible with either a vertical or a horizontal line array, such as the vertical directionality of the noise in a small azimuthal sector or the horizontal directionality at a particular elevation angle. It also appears that the use of horizontal line arrays and this 3-D technique could provide necessary measurement inputs to support design of volumetric array systems without the expense andor technical difficulty of deploying a volumetric array.

Subject Categories:

  • Acoustic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE