Passive acoustic tomography: new concepts and applications using marine mammals: a review

• Published in: Journal of the Marine Biological Association of the United Kingdom
• Main Authors: Gervaise, C., Vallez, S., Ioana, C., Stephan, Y., Simard, Y.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 2007
• Subjects: Aquatic Science; Beluga; Beluga*
• Online Access: http://dx.doi.org/10.1017/s0025315407054872; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315407054872

This paper presents the new concept of passive acoustic tomography which allows ocean data collection with a passive acoustic remote sensing process. The originality lies in using acoustic sources of opportunity such as surface noise, radiated ship noise and marine mammal calls. Such use of passive tomography is a promising way to reduce acoustic emissions in oceans. A review is first presented, including the description of new concepts of covert active, assisted passive and autonomous tomography, followed by applications on real world data. Under the assumptions of multipath propagation and measurements performed by a sparse network of hydrophones, a time–frequency processor is proposed to simultaneously estimate the source location and the impulse response of the propagation channel for marine mammal calls used as opportunistic sources (multipath structure, time delay and attenuation are estimated). Promising results are obtained on real data coming from the Laurentian channel where wideband beluga calls (1 to 3 kHz) are measured by a sparse network of 6 bottom hydrophones.