Ambient Noise Statistics for Sonar Modelling - Final Report
MACDONALD DETTWILER AND ASSOCIATES LTD DARTMOUTH (NOVA SCOTIA)
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This report documents the work done to process EC-SWAN sonobuoy data collected monthly over a 12-month period in late 1995 and 1996. Nine or more sonobuoys were dropped at each of four sites, and included calibrated Low Frequency Analysis and Ranging LOFAR, Vertical Line Array VLA and Directional Frequency Analyzing and Recording DIFAR types. The data were processed to determine statistics for use in synthetic sonar data modelling. The data were processed using 8K Fast Fourier Transforms FFT and 4 second incoherent averages. The data sample rate was 6147.5 Hz. Statistics were then computed for five-minute blocks, and averaged to determine the mean statistic over the one-hour sample time. These data are intended to provide a characterization of the probability density functions for ambient noise in Canadian waters that can be used for input to sonar simulation software.