Measuring volume backscattering strength of surface fish schools by scanning sonar
نویسندگان
چکیده
منابع مشابه
Measurement of Fish School Backscattering Strength Directivity Using Omnidirectional Scanning Sonar*
The horizontal acoustic backscattering strength of a fish school is an important factor for fisheries and for estimation of the size of a fish school using omnidirectional scanning sonar. However, the backscattering strength of a fish school is influenced by their behavior and orientation because the individual fish in the fish school have strong directivity of target strength. This paper discu...
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We present a novel framework for analysis and visualization of fish schools in 3D sonar surveys. The 3D sonar technology is new and there are no applications to visualize the data in 3D. We have created an application called Sonar Explorer that satisfies the requirements of domain scientists. Sonar Explorer provides easy and intuitive semi-automatic fish school tracking and survey map generatio...
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Feed waste results in increased production costs to the cage fish farming industry and produces negative environmental impacts. A computerized system, consisting of digital scanning sonar and current meter, was developed for monitoring, assessment, and optimization of the fish feeding process. The system can detect and monitor quantity and direction of wasted food pellets and also predict the t...
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INTRODUCTION Multi-beam sonar (MBS) systems have been traditionally used to acquire bathymetric data for mapping purposes. As such, they were developed to produce a swath of wide angle perpendicular to the vessel track (typically upwards of 120°), narrow angle in the alongtrack direction (typically in the order of 0.5-1.5°), and to store only the data from depths near to the seafl oor. The MBS ...
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This work is concerned with the estimation of the bottom backscattering coefficient as a function of frequency and of incident angle. Generally, the backscattering coefficient is studied for a given frequency at various angle. But the backscattering depends not only on the angle, but also on the frequency. In our work, a wideband chirp sonar (20140kHz) with -3dB half-angle 12o has been used to ...
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ژورنال
عنوان ژورنال: NIPPON SUISAN GAKKAISHI
سال: 2003
ISSN: 1349-998X,0021-5392
DOI: 10.2331/suisan.69.153