Deep-ocean vertical noise directionality

Author

Carey, William M. ; Evans, Richard B. ; Davis, James A. ; Botseas, George

Author_Institution

US Naval Underwater Syst. Center, New London, CT, USA

Volume

15

Issue

4

fYear

1990

fDate

10/1/1990 12:00:00 AM

Firstpage

324

Lastpage

334

Abstract

The structure of beam noise measured at the output of a vertical array in a range dependent ocean basin was investigated using the modified wide-angle parabolic equation (PE). Noise sources were distributed throughout the basin, and the field due to each noise source at an array located in the midbasin was calculated. The response of the array to the superposition of the noise sources was found by beamforming. An efficient and direct approach that superimposes the noise sources on the PE field as the field is marched toward the array was developed. Downslope calculations of the midbasin vertical directionality were made between 50 and 400 Hz with this technique. Use of a geoacoustic model shows that the bottom behaves as a low-pass filter

Keywords

oceanography; underwater sound; 50 to 400 Hz; acoustic noise; deep sea; direction; ocean; range dependent ocean basin; underwater sound; vertical noise directionality; wide-angle parabolic equation; Acoustic noise; Frequency conversion; Low pass filters; Low-frequency noise; Marine vehicles; Noise level; Noise measurement; Oceans; Sea measurements; Sea surface;

fLanguage

English

Journal_Title

Oceanic Engineering, IEEE Journal of

Publisher

ieee

ISSN

0364-9059

Type

jour

DOI

10.1109/48.103528

Filename

103528