The Effects of Environmental Assessment on Model-Data Transmission Loss Agreement from Sea Trial Q290
Defence R and D Canada Atlantic Dartmouth, NS Canada
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The DRDC Atlantic sea trial Q290 provided an opportunity to measure and modeltransmission loss in a shallow-water environment. The transmission loss measurementsgathered, along with a complete set of environmental measurements, are used to testDRDC Atlantics Rapid Environmental Assessment capability and determine the extent towhich Rapid Environmental Assessment can improve propagation predictions overpredictions predicated on previously perceived parameters. It is found that in this trialenvironment, using in situ measurements of bathymetry and sound speed, as input to arange-dependent Gaussian beam model, provide a better fit to measured transmission loss by2-3 dB even over quite short less than 8 km ranges as compared to historical data fromstandard databases. The neglect or misestimate of other parameters, including wind speedand bottom type, can also result in large inaccuracies in model predictions of transmissionloss and sonar performance.