The Reflection of Low Frequency Sonar Signals from a Smooth Ocean Bottom. Part I. Experimental Reflection Losses at Locations off the California Coast and in the Bering Sea

Underwater acoustic tests in three different areas are discussed: Area I is in 200-fathom water while Areas II and III are deep-water, 2000-fathom areas. From the data obtained bottom reflection losses were computed as a function of grazing angle for low frequency, 0.7 to 3.0 kc sound pulses. Measur...

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Bibliographic Details
Main Authors: Whitney,J A, Yee,G S, Gardner,R R
Other Authors: NAVY ELECTRONICS LAB SAN DIEGO CA
Format: Text
Language:English
Published: 1963
Subjects:
Acoustic Detection and Detectors
Acoustics
*SONAR SIGNALS
*BOTTOM LOSS
UNDERWATER ACOUSTICS
ACOUSTIC VELOCITY
OCEAN BOTTOM TOPOGRAPHY
LOW FREQUENCY
OCEAN BOTTOM SOILS
NORTH PACIFIC OCEAN
ACOUSTIC REFLECTION
SEA TESTING
BERING SEA
MOST Project-2
Bering Sea
Pacific
Online Access:http://www.dtic.mil/docs/citations/ADA074407
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA074407
Description
Summary:Underwater acoustic tests in three different areas are discussed: Area I is in 200-fathom water while Areas II and III are deep-water, 2000-fathom areas. From the data obtained bottom reflection losses were computed as a function of grazing angle for low frequency, 0.7 to 3.0 kc sound pulses. Measurements in Area I utilized short pulses and acoustic-path geometries that would resolve the bottom reflected paths; the analysis was then accomplished by comparing the direct signal with the signal which suffers one bottom reflection. The experiments in the deep-water areas did not attempt acoustic path resolution and the bottom loss was derived from the difference between the measured propagation loss and the theoretical propagation loss for that range and for total reflection at the grazing angle. See also Part 2, AD-A074 408.

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