The Effects of Environmental Assessment on Model-Data Transmission Loss Agreement from Sea Trial Q290

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Authors
  1. Pecknold, S.P.
  2. Young, V.
  3. Scrutton, J.
  4. Hines, P.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
The DRDC Atlantic sea trial Q290 provided an opportunity to measure and model transmission loss in a shallow-water environment. The transmission loss measurements gathered, along with a complete set of environmental measurements, are used to test DRDC Atlantic’s Rapid Environmental Assessment capability and determine the extent to which Rapid Environmental Assessment can improve propagation predictions over predictions predicated on previously perceived parameters. It is found that in this trial environment, using in situ measurements of bathymetry and sound speed, as input to a range-dependent Gaussian beam model, provide a better fit to measured transmission loss by 2-3 dB even over quite short (less than 8 km) ranges as compared to historical data from standard databases. The neglect or misestimate of other parameters, including wind speed and bottom type, can also result in large inaccuracies in model predictions of transmission loss and sonar performance.

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Report Number
DRDC-ATLANTIC-TM-2006-007 — Technical Memorandum
Date of publication
01 Mar 2006
Number of Pages
42
DSTKIM No
CA028005
CANDIS No
525905
Format(s):
CD ROM

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