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Titolo:
Total performance check of quantitative echo sounders by using echoes fromsea bottom
Autore:
Aoyama, C; Hamada, E; Furusawa, M;
Indirizzi:
Tokyo Univ Fisheries, Minato Ku, Tokyo 1088477, Japan Tokyo Univ Fisheries Tokyo Japan 1088477 Minato Ku, Tokyo 1088477, Japan
Titolo Testata:
NIPPON SUISAN GAKKAISHI
fascicolo: 1, volume: 65, anno: 1999,
pagine: 78 - 85
SICI:
0021-5392(199901)65:1<78:TPCOQE>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTEGRATOR; FREQUENCY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Aoyama, C Tokyo Univ Fisheries, Minato Ku, 4-5-7 Konan, Tokyo 1088477, Japan Tokyo Univ Fisheries 4-5-7 Konan Tokyo Japan 1088477 477, Japan
Citazione:
C. Aoyama et al., "Total performance check of quantitative echo sounders by using echoes fromsea bottom", NIP SUIS G, 65(1), 1999, pp. 78-85

Abstract

Even if a quantitative echo sounder is calibrated accurately before installing its transducer on a ship huh or on a towed body, it is necessary to calibrate it by using a standard sphere during a survey at sea. The sphere calibration is not necessarily easy, however, because the ship must be settled by anchors and the standard sphere should be suspended on the beam axis of the transducer; further it is not easy to calibrate the equivalent beam width. Therefore, another complimentary method is expected to check the quantitative echo sounder performance. We developed a method to check total performance, including the equivalent beam width, of quantitative echo sounders. In the method, we only measure averaged echo intensity from the flat seabottom by the echo integrator. If the surface backscattering strength of the sea bottom is already known, an absolute check is possible, but if not, a relative check can be done. First, a relationship between the echo integrator output and surface backscattering strength of the sea bottom is derived and examined by measurements. Next, we conducted an actual performance check of quantitative echo sounders using this method and confirmed the effectiveness of the proposed method.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 11:48:30