The Effect of Scattering and Absorption on Noise from a Cavitating Noise Source in the Subsurface Ocean Layer.

When investigating the detection performance of a passive homing torpedo used against shallow draft surface ships, certain environmental factors such as the rough sea surface and the bubble dominated inhomogeneous layer near the sea surface have to be considered. This thesis attempts to gain some in...

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Bibliographic Details
Main Author: Tronstad,Yngvar Dag
Other Authors: NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Format: Text
Language:English
Published: 1981
Subjects:
Torpedoes
Acoustics
*ACOUSTIC ABSORPTION
*ACOUSTIC SCATTERING
*UNDERWATER ACOUSTICS
*HOMING TORPEDOES
COASTAL REGIONS
OCEAN SURFACE
SURFACE ROUGHNESS
THESES
SHALLOW WATER
BUBBLES
SOUND TRANSMISSION
HETEROGENEITY
SEA STATES
SURFACE TARGETS
NORWEGIAN SEA
TORPEDO ATTACK
LOW FREQUENCY
SUBSURFACE
ABSORPTION COEFFICIENTS
TURNING(MANEUVERING)
PASSIVE SONAR
CAVITATION NOISE
Square low detectors
Shadowing
Norwegian Sea
Online Access:http://www.dtic.mil/docs/citations/ADA105758
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA105758
Description
Summary:When investigating the detection performance of a passive homing torpedo used against shallow draft surface ships, certain environmental factors such as the rough sea surface and the bubble dominated inhomogeneous layer near the sea surface have to be considered. This thesis attempts to gain some insight into the behavior of a homing torpedo system during its critical attack phase, as well as getting some indications of the relative importance of the scattering mechanisms and the induced tactical limitations. An idealized propagation model was used as reference of comparison. For a given sea state and target speed the results stress the importance of low operating frequency as well as a high maximum turn rate. They also point to the importance of having a search depth below the bubble-dominated subsurface layer, and a variable speed capability during the torpedo's attack phase. (Author)

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