Blar i Havforskningsinstituttet på emneord "ekkolodd"

Viser treff 1-20 av 66

    • A vessel specific bias in echo sounder recordings during trawling 

      Handegard, Nils Olav; Hjellvik, Vidar (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 

      Foote, Kenneth G.; Røttingen, Ingolf (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 

      Foote, Kenneth G. (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 

      Korneliussen, Rolf J. (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? 

      Handegard, Nils Olav (Conference object, 2010-09-15)

    • Automatisk fôringskontroll via ekkoloddregistrering av fôrpellets 

      Bjordal, Åsmund; Furevik, Dag M. (Havforskningsnytt, Working paper, 1991)

    • Avoidance reactions of herring to a survey vessel, studied by scanning sonar 

      Ona, Egil; Toresen, Reidar (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 

      Foote, Kenneth G. (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 

      Foote, Kenneth G.; Simmons, James A. (Others, 2006)

    • Bergen Echo Integrator: An Introduction 

      Knudsen, Hans Petter (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 

      Ona, Egil (Havforskningsnytt, Working paper, 1998)

    • The Bergen multifrequency analyzer (BMA): A new toolbox for acoustic catagorization and species identification 

      Ona, Egil; Korneliussen, Rolf J.; Knudsen, Hans Petter; Rang, Kjell; Eliassen, Inge; Heggelund, Yngve; Patel, Daniel (Others, 2004)

    • Bestandsmålinger kan nå gjøres med ekkolodd og sonar 

      Misund, Ole Arve (Havforskningsnytt, Working paper, 1996)

    • Broadband echo spectra from euphausiids and copepods 

      Foote, Kenneth G.; Knutsen, Tor; Atkins, Philip R.; Bongiovanni, Claire; Francis, David T. I.; Eriksen, Peter K.; Larsen, Mette Torp; Mortensen, Tom (Others, 2000)

    • Calibration reflector 

      Foote, Kenneth G. (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 

      Foote, Kenneth G. (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 

      Foote, Kenneth G. (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 

      Kieser, Robert; Ona, Egil (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 

      Foote, Kenneth G.; MacLennan, David N. (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 

      Foote, Kenneth G. (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 ...