Localisation of right whale sounds in the workshop bay of fundy dataset by spectrogram cross-correlation and hyperbolic fixing
Keywords:Acoustic waves, Correlation methods, Error analysis, Hydrophones, Oceanography, Spectrum analysis, Datasets, Gunshot sounds, Hyperbolic fixing, Whale sounds
AbstractIn September 2002, five ocean-bottom hydrophones recorded acoustic data in the Bay of Fundy at 1200 Hz sampling frequency for 165.6 h. Arrival time differences for 15 right whale sounds (5 gunshots, 10 tonals) were determined by spectrogram cross-correlation of logarithmic (i.e. dB re 1 ?Pa 2/Hz) spectral densities. The sound source locations were estimated from the intersections of the linearly independent equal time difference hyperbolae for different hydrophone pairs. The root-mean-square (RMS) localisation error was examined using three sound speeds. The lowest average RMS error of 0.85 km was obtained for 1485 m/s, roughly 7 m/s less than the measured average sound speed. The non-gunshot sounds had greater localisation error than the gunshot sounds by 0.4 km. The mean and maximum ranges from the centre hydrophone in the array were 10 km and 33 km respectively.
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