Estimation of heading gyrocompass error using a GPS 3DF system: Impact on ADCP measurements

Authors

  • Simón Ruiz Grupo de Oceanografía Interdisciplinar, IMEDEA (CSIC-UIB)
  • Jordi Font Institut de Ciències del Mar, CMIMA, CSIC
  • Gwyn Griffiths Ocean Technology Division, Southampton Oceanography Center
  • Arturo Castellón Unidad de Tecnología Marina, CMIMA, CSIC

DOI:

https://doi.org/10.3989/scimar.2002.66n4347

Keywords:

ADCP, heading, horizontal currents, Alboran Sea

Abstract


Traditionally the horizontal orientation in a ship (heading) has been obtained from a gyrocompass. This instrument is still used on research vessels but has an estimated error of about 2-3 degrees, inducing a systematic error in the cross-track velocity measured by an Acoustic Doppler Current Profiler (ADCP). The three-dimensional positioning system (GPS 3DF) provides an independent heading measurement with accuracy better than 0.1 degree. The Spanish research vessel BIO Hespérides has been operating with this new system since 1996. For the first time on this vessel, the data from this new instrument are used to estimate gyrocompass error. The methodology we use follows the scheme developed by Griffiths (1994), which compares data from the gyrocompass and the GPS system in order to obtain an interpolated error function. In the present work we apply this methodology on mesoscale surveys performed during the observational phase of the OMEGA project, in the Alboran Sea. The heading-dependent gyrocompass error dominated. Errors in gyrocompass heading of 1.4-3.4 degrees have been found, which give a maximum error in measured cross-track ADCP velocity of 24 cm s-1.

Downloads

Download data is not yet available.

Downloads

Published

2002-12-30

How to Cite

1.
Ruiz S, Font J, Griffiths G, Castellón A. Estimation of heading gyrocompass error using a GPS 3DF system: Impact on ADCP measurements. scimar [Internet]. 2002Dec.30 [cited 2021Sep.28];66(4):347-54. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/594

Issue

Section

Articles

Most read articles by the same author(s)