Quantifying error sources that affect long-term accuracy of Doppler velocity logs

Jerker Taudien, Sven G. Bilén

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

A Doppler velocity log measures relative velocity between an instrument and the bottom of a body of water by transmitting acoustic pulses that are scattered off the bottom. The scattered sound is received and the Doppler shift is measured. Like any other sensor, the data quality of a Doppler velocity log can be quantified by a variance and a bias. The goal of this work is to model error sources that do not average out over time, quantify those sources under various operating and environmental conditions, and derive a statistically-significant range of expected long-term errors. The following error sources are analyzed: absorption bias, terrain bias, side-lobe coupling, beam alignment, clock drift, and speed-of-sound error, which is a function of temperature, salinity, and pressure. Terrain bias is dependent on aperture diameter, aperture type (piston or phased-array), Janus angle, and bottom type. Absorption bias is dependent on aperture diameter, aperture type (piston or phased-array), Janus angle, the acoustic absorption coefficient, and altitude. Side-lobe coupling error is dependent on beam pattern, bottom slope, and instrument attitude. The magnitude of the remaining error sources depend on component tolerances and auxiliary sensor accuracies. The effect on the horizontal velocity of each error is analyzed in detail and the analysis is carried out under various environmental conditions and operating conditions.

Original languageEnglish (US)
Title of host publicationOCEANS 2016 MTS/IEEE Monterey, OCE 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509015375
DOIs
StatePublished - Nov 28 2016
Event2016 OCEANS MTS/IEEE Monterey, OCE 2016 - Monterey, United States
Duration: Sep 19 2016Sep 23 2016

Publication series

NameOCEANS 2016 MTS/IEEE Monterey, OCE 2016

Other

Other2016 OCEANS MTS/IEEE Monterey, OCE 2016
CountryUnited States
CityMonterey
Period9/19/169/23/16

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Oceanography
  • Ocean Engineering

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    Taudien, J., & Bilén, S. G. (2016). Quantifying error sources that affect long-term accuracy of Doppler velocity logs. In OCEANS 2016 MTS/IEEE Monterey, OCE 2016 [7761084] (OCEANS 2016 MTS/IEEE Monterey, OCE 2016). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/OCEANS.2016.7761084