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Accession Number ADA571817
Title Quantifying, Predicting, and Exploiting Uncertainty (QPE).
Publication Date Sep 2011
Media Count 5p
Personal Author J. F. Lynch
Abstract The long term goal of our QPE work is to: (1) quantitatively understand what the uncertainties are in low frequency (10-1500 Hz) acoustic propagation and noise that are caused by variable and complex oceanography and seabed structure, (2) determine the limits to predicting the fluctuating and variable propagation and noise in this frequency regime and others, and (3) ascertain what naval advantage may be gained (if any) by understanding the nature of the uncertainty. Our (continuing) primary objectives this year were to analyze the data from the main experiment in the East China Sea in 2009, and to work towards explanations of what was observed. Particular emphasis was placed on: (1) ambient noise data analysis, and (2) the theoretical explanation of the azimuthal anisotropy of transmission loss (TL) observed. The impacts of our work so far are that we have seen interesting effects concerning: (1) azimuthal anisotropy, (2) ambient noise, and (3) propagation over slopes and canyons that may have naval sonar implications. We also are tying in to the larger Prediction, Quantification, and Exploitation of Uncertainty theme via the Dyer PPD. One eventual transition of our work will be to naval sonar systems and to sonar analysis, where the interest is in the error bars in ocean acoustic field and system performance prediction.
Keywords Acoustic propagation
Ambient noise
Azimuthal anisotropy
East china sea
Low frequencies
Noise analyzers
Ocean acoustic fields
Time series analysis
Transmission loss
Underwater acoustics

Source Agency Non Paid ADAS
NTIS Subject Category 47C - Physical & Chemical Oceanography
72F - Statistical Analysis
46A - Acoustics
Corporate Author Woods Hole Oceanographic Institution, MA.
Document Type Technical report
Title Note Annual rept.
NTIS Issue Number 1316
Contract Number N00014-08-1-0763

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