HIGH-FREQUENCY REVERBERATION IN SHALLOW WATER

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Authors
  1. Hines, P.C.
  2. Ellis, D.D.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Monostatic reverberation measurements were collected in shallow water, over a coarse gravel and cobble bottom, 100 m deep, off the coast of Nova Scotia. Data were collected at frequencies of 21, 28, and 36 kHz using linear FM pulses of 2-kHz bandwidth and 0.160-s duration. An anchored, high-frequency active sonar array deployed at a depth of 42 m was used to collect the data. The reverberation measurements were compared with estimates computed with the NUWC generic sonar model (GSM). The data were reasonably well modeled for times greater than 0.2 s after pulse transmission byneglecting surface reverberation and using Lambert's rule for bottom backscattering with a scattering coefficient of -27 dB, independent of frequency. At all three frequencies, the data and model show a peak approximately 0.9 s after pulse transmission. This peak results from a focusing effect that the downard-refracting sound-speed profile has on the interaction of the rays with the bottom.
Keywords
Sound speed profile
Date of publication
30 Apr 1997
Number of Pages
7
Reprinted from
IEEE Journal of Oceanic Engineering, vol 22, no 2, 1997, p 292-298
DSTKIM No
97-03515
CANDIS No
503687
Format(s):
Hardcopy;Document Image stored on Optical Disk

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