NDLI: A marine mammal acoustic detection and localization algorithm using spectrogram image correlation

Content Provider	IEEE Xplore Digital Library
Author	Ramaswamy, B. Potty, G.R. Miller, J.H.
Copyright Year	2001
Description	Author affiliation: Pyrcon, LLC, Narragansett, RI, USA (Ramaswamy, B.)
Abstract	Detection and localization of marine mammals at sea can be an important aspect of research and conservation. Detection can be accomplished on a single hydrophone using a simple pattern recognition technique that exploits the time-frequency complexity of the whale vocalization. In particular the frequency modulation of the signal can be an important feature by which vocalizations can be identified. The slope, duration and SNR of the frequency modulated signal in the time-frequency domain are important parameters which aid in the detection. When the call is detected on an array of hydrophones, time difference of arrival can be utilized for localization. This process can be complicated by multiple calls from a single animal, calls from multiple animals, transient noise sources and acoustics propagation effects. A technique which has had success involves the cross-correlation of the spectrogram image of the detected call with call on other hydrophones. This is a variation of the approach implemented by Mellinger and Clark (2000) to identify bowhead whale calls. They create a time-frequency kernel to correlate with received signals on a single phone. The technique presented in this paper uses one of the received calls as the template to match with other calls on other phones in the array. While Mellinger and Clark were required to search in time frequency, this algorithm need only search in time on detected signals. We present results for pilot and sperm whales on a bottom mounted array in deep water.
Starting Page	2354
Ending Page	2358
File Size	613381
Page Count	5
File Format	PDF
ISBN	0933957289
DOI	10.1109/OCEANS.2001.968367
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-11-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Marine Technology Soc.
Subject Keyword	Acoustic signal detection Time frequency analysis Sonar equipment Whales Frequency modulation Animals Pattern recognition Signal processing Time difference of arrival Acoustic propagation
Content Type	Text
Resource Type	Article

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