Comparison of narrow band and one third octave ambient noise measurements
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Authors
Lovelace, Ronald M.
Subjects
Ambient noise
ARGOS
Drifting buoys
Marine winds
Oceanographic measurements
ASNI
NADS
Air-sea interaction
WOTAN
ARGOS
Drifting buoys
Marine winds
Oceanographic measurements
ASNI
NADS
Air-sea interaction
WOTAN
Advisors
Dunlap, C.R.
Bourke, R.H.
Date of Issue
1985-06
Date
June 1985
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
In preparation for the eventual testing of a drifting environmental acoustic buoy, the ambient noise in an area off the Monterey, California coast was measured using to analysis methods. Narrow band processing (9 Hz) was com pared to 1/3 octave band processing for frequencies up to 2500 Hz. Noise generation due to shipping and local wind was examined for the contribution of each to the noise spectrum. Noise spectrum levels measured using either approach agreed within 2 dB, usually within 1 dB. Local and distant shipping varied on a daily basis and appeared to coincide with port activity. The mean variability at 50 Hz was 5 dB for hourly records influenced by individual ships. Distant shipping at 50 Hz showed a 2-3 dB variation. Also, this study shows that mean ambient noise curves may be used to estimate wind speed using the ambient noise at 1700 Hz, provided there are no local ships within 16 km. Ships at greater range appear to contribute little to the wind-dependent spectrum at 1700 Hz.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics Curriculum Group
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
NPS-68-85-019
Sponsors
Space and Naval Warfare Systems Command (SPAWAR 6124)
Funder
PE 62759N
N0003985WRDW034
Format
76 p.: ill.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.