Acoustic detection and localization of whales in bay of fundy and St. Lawrence estuary critical habitats
Keywords:Acoustic noise, Coastal engineering, Computational methods, Correlation methods, Ecosystems, Hydrophones, Acoustic detection, Critical habitats, Noise spectral suppression, Whales
AbstractThe detection and localization of marine mammals using passive acoustics is explored for two critical habitats in Eastern Canada. Two-dimensional hyperbolic localization is performed on time differences of arrivals of specific calls on grids of coarsely spaced autonomous recorders and on a shore-linked coastal array of closely spaced hydrophones. Delays are computed from cross-correlation and spectrogram cross-coincidence on signals enhanced with high-frequency emphasis and noise spectral suppression techniques. The outcomes and relative performance of the two delay estimation methods are compared. The difficulties encountered under the particular conditions of these two environments are discussed for the point of view of automated localisation for monitoring whales.
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