Estimation and correction for the effect of sound velocity variation on GPS/Acoustic seafloor positioning: An experiment off Hawaii Island

Yukihito Osada; Toshihiko Kanazawa; Shigeru Nakao; Shin ichi Sakai; Hiromi Fujimoto; Satoshi Miura; Aaron Sweeney; John Hildebrand; David Chadwell

doi:10.1186/BF03352464

Estimation and correction for the effect of sound velocity variation on GPS/Acoustic seafloor positioning: An experiment off Hawaii Island

Yukihito Osada, Toshihiko Kanazawa, Shigeru Nakao, Shin ichi Sakai, Hiromi Fujimoto, Satoshi Miura, Aaron Sweeney, John Hildebrand, David Chadwell

SCI - Research Center for Prediction of Earthquakes and Volcanic Eruptions (RCPEVE)

Research output: Contribution to journal › Article › peer-review

45 Citations (Scopus)

Abstract

A GPS/Acoustic experiment on the southeastern slope of Hawaii Island presented precise seafloor positioning in the condition of large water depth (2.5-4.5 km) and large velocity variations. We estimated sound velocity variations from acoustic ranging, and found that temperature variation can well explain the velocity variation. The effect of daily variation in the sound velocity amounted to+/-0.7 m on acoustic ranging of 4-7 km with a fixed velocity structure. CTD data observed about every 3 hours could decrease the range residuals to+/-0.4 m. These large residuals were fairly well canceled in the positioning of the array center of three acoustic transponders. The estimated precision of the array center positioning was about 3 cm in latitude and longitude.

Original language	English
Journal	Earth, Planets and Space
Volume	55
Issue number	10
DOIs	https://doi.org/10.1186/BF03352464
Publication status	Published - 2003

Keywords

acoustic ranging
GPS/Acoustic
Hawaii Island
seafloor positioning
sound velocity

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10.1186/BF03352464

Cite this

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title = "Estimation and correction for the effect of sound velocity variation on GPS/Acoustic seafloor positioning: An experiment off Hawaii Island",

abstract = "A GPS/Acoustic experiment on the southeastern slope of Hawaii Island presented precise seafloor positioning in the condition of large water depth (2.5-4.5 km) and large velocity variations. We estimated sound velocity variations from acoustic ranging, and found that temperature variation can well explain the velocity variation. The effect of daily variation in the sound velocity amounted to+/-0.7 m on acoustic ranging of 4-7 km with a fixed velocity structure. CTD data observed about every 3 hours could decrease the range residuals to+/-0.4 m. These large residuals were fairly well canceled in the positioning of the array center of three acoustic transponders. The estimated precision of the array center positioning was about 3 cm in latitude and longitude.",

keywords = "acoustic ranging, GPS/Acoustic, Hawaii Island, seafloor positioning, sound velocity",

author = "Yukihito Osada and Toshihiko Kanazawa and Shigeru Nakao and Sakai, {Shin ichi} and Hiromi Fujimoto and Satoshi Miura and Aaron Sweeney and John Hildebrand and David Chadwell",

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T1 - Estimation and correction for the effect of sound velocity variation on GPS/Acoustic seafloor positioning

T2 - An experiment off Hawaii Island

AU - Osada, Yukihito

AU - Kanazawa, Toshihiko

AU - Nakao, Shigeru

AU - Sakai, Shin ichi

AU - Fujimoto, Hiromi

AU - Miura, Satoshi

AU - Sweeney, Aaron

AU - Hildebrand, John

AU - Chadwell, David

PY - 2003

Y1 - 2003

N2 - A GPS/Acoustic experiment on the southeastern slope of Hawaii Island presented precise seafloor positioning in the condition of large water depth (2.5-4.5 km) and large velocity variations. We estimated sound velocity variations from acoustic ranging, and found that temperature variation can well explain the velocity variation. The effect of daily variation in the sound velocity amounted to+/-0.7 m on acoustic ranging of 4-7 km with a fixed velocity structure. CTD data observed about every 3 hours could decrease the range residuals to+/-0.4 m. These large residuals were fairly well canceled in the positioning of the array center of three acoustic transponders. The estimated precision of the array center positioning was about 3 cm in latitude and longitude.

AB - A GPS/Acoustic experiment on the southeastern slope of Hawaii Island presented precise seafloor positioning in the condition of large water depth (2.5-4.5 km) and large velocity variations. We estimated sound velocity variations from acoustic ranging, and found that temperature variation can well explain the velocity variation. The effect of daily variation in the sound velocity amounted to+/-0.7 m on acoustic ranging of 4-7 km with a fixed velocity structure. CTD data observed about every 3 hours could decrease the range residuals to+/-0.4 m. These large residuals were fairly well canceled in the positioning of the array center of three acoustic transponders. The estimated precision of the array center positioning was about 3 cm in latitude and longitude.

KW - acoustic ranging

KW - GPS/Acoustic

KW - Hawaii Island

KW - seafloor positioning

KW - sound velocity

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Estimation and correction for the effect of sound velocity variation on GPS/Acoustic seafloor positioning: An experiment off Hawaii Island

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Keywords

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