Blar i Brage IMR på emneord "ekkolodd"
Viser treff 1-20 av 66
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A vessel specific bias in echo sounder recordings during trawling
(ICES CM Documents;2004/R:35, Working paper, 2004) -
Acoustic assessment of Norwegian spring spawning herring in the wintering area, December 1995 and January 1995
(ICES CM Documents;1995/H:9, Working paper, 1995)The abundance of the mature component of the stock of Norwegian spring spawning herring has been estimated based on a series of echo integration surveys. These were performed in the wintering area of Ofotfjord, Tysfjord, and ... -
Acoustic sampling volume for cod
(ICES CM Documents;1989/B:5, Working paper, 1989)This is expressed through the effective equivalent beam angle * for cod as represented by measurements of the tilt angle dependence of target strength. The functional form of * is approximated for each of several behaviour ... -
Advances in Bergen Echo Integrator
(ICES CM Documents;1993/B:28, Working paper, 1993)The Bergen Echo Integrator (BEl) is a software system designed for convenient postprocessing of echo sounder data. BEl is realized in international standards and is essentially machine independent. Development of BEl for ... -
Akustikk og fiskeåtferd: korleis kan vi observera åtferd og kva finn vi ut?
(Conference object, 2010-09-15) -
Automatisk fôringskontroll via ekkoloddregistrering av fôrpellets
(Havforskningsnytt, Working paper, 1991) -
Avoidance reactions of herring to a survey vessel, studied by scanning sonar
(ICES CM Documents;1988/H:46, Working paper, 1988)The behavioural response of a shallow herring layer to a steaming vessel has been studied by the use of a high-resolution scanning sonar technique. When the vessel was completely darkened, no significant reaction important ... -
Bad-weather calibration of split-beam echo sounder systems
(ICES CM Documents;1990/B:22, Working paper, 1990)A condition for standard-target calibration is stability of the sonar platform and target rig. This condition cannot always be met, nor need it be when the transducer has a split-beam function. Since the position of ... -
Bat sonar and the role of frequency diversity
(Others, 2006) -
Bergen Echo Integrator: An Introduction
(ICES CM Documents;1989/B:9, Working paper, 1989)The design of a new echo integrator system is outlined. The B.E.I. is based on preprocessed data from the new SIMRAD EK500 scientific acoustic measurement system. Raw data are displayed and interpreted on a graphics ... -
Bergen Ekko Integrator
(Havforskningsnytt, Working paper, 1998) -
Bestandsmålinger kan nå gjøres med ekkolodd og sonar
(Havforskningsnytt, Working paper, 1996) -
Broadband echo spectra from euphausiids and copepods
(Others, 2000) -
Calibration reflector
(ICES CM Documents;1989/B:4, Working paper, 1989)Calibration of scientific echo sounders and integrators entails, inter alia, measurement of the dynamic range. This can be done by repeating on-axis measurements of echoes from each of two different standard targets. ... -
Coincidence echo statistics
(Journal article; Peer reviewed, 1996)Two scatterers at similar range give an echo which may appear to be due to a single scatterer. Methods for determining target strength that depend on resolving single scatterers may fail in this instance. Statistics ... -
Coincidence echo statistics
(ICES CM Documents;1994/B:40, Working paper, 1994)Two scatterers at similar range give an echo which may appear to be due to a single scatterer. Methods for determining target strength that depend on resolving single scatterers may fail in this instance. Statistics associated ... -
Comparative analysis of split beam data
(ICES CM Documents;1988/B:44, Working paper, 1988)Split beam data can provide high quality, in situ, fish target strength estimates, however a careful calibration is required to realize this potential. In same cases a standard target has been used to make a large number ... -
Comparison of copper and tungsten carbide calibration spheres
(Journal article; Peer reviewed, 1984)The properties of calibration spheres made from electrical-grade copper, denoted Cu, and tungsten carbide with 6% cobalt binder, denoted WC, are examined theoretically. Effects of variations in material, medium, and equipment ... -
Cylindrical sonar design for fish echo surveying
(ICES CM Documents;1988/B:3, Working paper, 1988)Most applications of echo integration involve use of a fixed single-beam transducer that is rather narrow and downwards-oriented. It is often desired to sense fish in other directions, for example, to assess components ...