Acoustic measurement of near-bottom fish with a directional transducer is generally problematical because the powerful bottom echo interferes with weaker echoes from fish within the main lobe but at greater ranges than that of the bottom. The volume that is obscured is called the dead zone. This has already been estimated for the special case of a flat horizontal bottom when observed by an echo sounder with a stable vertical transducer beam [Ona, E., and Mitson, R. B. (1996). ICES J. Mar. Sci. 53, 677–690]. The more general case of observation by a split-beam echo sounder with a transducer mounted on a noninertial platform is addressed here. This exploits the capability of a split-beam echo sounder to measure the bottom slope relative to the beam axis and thence to allow the dead-zone volume over a flat but sloping bottom to be estimated analytically. The method is established for the Simrad EK60 scientific echo sounder, with split-beam transducers operating at 18, 38, 70, 120, and . It is validated by comparing their estimates of seafloor slope near the Lofoten Islands, N67-70, with simultaneous measurements made by two hydrographic multibeam sonars, the Simrad and systems working in tandem.
Skip Nav Destination
Article navigation
February 2009
February 01 2009
Inferring the acoustic dead-zone volume by split-beam echo sounder with narrow-beam transducer on a noninertial platform
Ruben Patel;
Institute of Marine Research
, P.O. Box 1870 Nordnes, NO-5817 Bergen, Norway
Search for other works by this author on:
Geir Pedersen;
Geir Pedersen
Institute of Marine Research
, P.O. Box 1870 Nordnes, NO-5817 Bergen, Norway
Search for other works by this author on:
Egil Ona
Egil Ona
Institute of Marine Research
, P.O. Box 1870 Nordnes, NO-5817 Bergen, Norway
Search for other works by this author on:
a)
Electronic mail: ruben@imr.no
J. Acoust. Soc. Am. 125, 698–705 (2009)
Article history
Received:
November 19 2008
Accepted:
November 25 2008
Citation
Ruben Patel, Geir Pedersen, Egil Ona; Inferring the acoustic dead-zone volume by split-beam echo sounder with narrow-beam transducer on a noninertial platform. J. Acoust. Soc. Am. 1 February 2009; 125 (2): 698–705. https://doi.org/10.1121/1.3050325
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Pay-Per-View Access
$40.00
Citing articles via
A survey of sound source localization with deep learning methods
Pierre-Amaury Grumiaux, Srđan Kitić, et al.
Co-speech head nods are used to enhance prosodic prominence at different levels of narrow focus in French
Christopher Carignan, Núria Esteve-Gibert, et al.
In a presentation, Ted once said I'd like my epitaph to be “I simplified.”
Paul Schomer, Truls Gjestland
Related Content
Detecting Atlantic herring by parametric sonar
J. Acoust. Soc. Am. (March 2010)
Observing individual fish behavior in fish aggregations: Tracking in dense fish aggregations using a split-beam echosounder
J. Acoust. Soc. Am. (July 2007)
Range compensation for backscattering measurements in the difference-frequency nearfield of a parametric sonar
J. Acoust. Soc. Am. (May 2012)
Investigation of noninertial cavitation produced by an ultrasonic horn
J. Acoust. Soc. Am. (November 2011)
Three dimensional observation of pelagic fish schools by multibeam echosounder ME70
J Acoust Soc Am (October 2016)