Sonar Surveillance through a North Pacific Ocean Front

This report considers the problem of detecting long-range, low- frequency, narrowband CW sources for sound transmission through ocean fronts. Sound propagation through the subarctic sound-speed front north of Hawaii was studied using PARKA I data. A new stochastic model of sound intensity was applie...

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Bibliographic Details
Main Author: Neubert, J. A.
Other Authors: NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
Format: Text
Language:English
Published: 1981
Subjects:
Undersea and Antisubmarine Warfare
Acoustic Detection and Detectors
*SONAR
*OCEAN SURVEILLANCE
LONG RANGE(DISTANCE)
SOUND TRANSMISSION
UNDERWATER ACOUSTICS
SUBMARINE DETECTION
MASKING
NORTH PACIFIC OCEAN
FRONTS(OCEANOGRAPHY)
NARROWBAND
DEEP OCEANS
UNDERWATER SOUND SIGNALS
UNDERSEA SURVEILLANCE
LOW FREQUENCIES
PARKA 1 PROJECT
PARKA(PACIFIC ACOUSTIC RANGE KANEOHE ALASKA)
Pacific
Parka
Subarctic
Alaska
Online Access:http://www.dtic.mil/docs/citations/ADC026529
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADC026529
Description
Summary:This report considers the problem of detecting long-range, low- frequency, narrowband CW sources for sound transmission through ocean fronts. Sound propagation through the subarctic sound-speed front north of Hawaii was studied using PARKA I data. A new stochastic model of sound intensity was applied to the PARKA I front. This model introduces two new stochastic factors that modify deterministic sound propagation. Comparison of the stochastic with the deterministic sound intensity model showed that the two stochastic factors were necessary to account for sound propagation behavior in the frontal region. These stochastic factors showed that horizontal frontal sound-speed gradients have a pronounced effect upon the propagation of sound and, hence, the masking of sources by ocean fronts. Suggestions for measurements to better understand the masking of sources by fronts in the deep ocean are given.

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