Digitale Bibliotheek
Sluiten Bladeren door artikelen uit een tijdschrift
<< vorige    volgende >>
     Tijdschrift beschrijving
       Alle jaargangen van het bijbehorende tijdschrift
         Alle afleveringen van het bijbehorende jaargang
           Alle artikelen van de bijbehorende aflevering
                                       Details van artikel 6 van 7 gevonden artikelen
  Precise Multibeam Acoustic Bathymetry
Titel: Precise Multibeam Acoustic Bathymetry
Auteur: Geng, Xueyi
Zielinski, Adam
Verschenen in: Marine geodesy
Paginering: Jaargang 22 (1999) nr. 3 pagina's 157-167
Jaar: 1999-07-01
Inhoud: The maximum error in ocean depth measurement as specified by the International Hydrographic Organization is 1% for depth greater than 30m. Current acoustic multibeam bathymetric systems used for depth measurement are subject to errors from various sources which may significantly exceed this limit. The lack of sound speed profiles may be one significant source of error. Because of the limited ability of sound speed profile measurement, depth values are usually estimated using an assumed profile. If actual sound speed profiles are known, depth estimate errors can be corrected using ray-tracing methods. For depth measurements, the calculation of the location at which a sound pulse impinges on the sea bottom varies with the variation of the sound speed profile. We demonstrate that this location is almost unchanged for a family of sound speed profiles with the same surface value and the same area under them. Based on this observation, we can construct a simple constant-gradient equivalent sound speed profile to correct errors. Compared with ray-tracing methods, the equivalent sound speed profile method is more efficient. If a vertical depth is known (or independently measured), then depth correction for a multibeam system can be accomplished without knowledge of the actual sound speed profile. This leads to a new type of precise acoustic multibeam bathymetric system.
Uitgever: Taylor & Francis
Bronbestand: Elektronische Wetenschappelijke Tijdschriften

                             Details van artikel 6 van 7 gevonden artikelen
<< vorige    volgende >>
 Koninklijke Bibliotheek - Nationale Bibliotheek van Nederland