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

Yukihito Osada, Hiromi Fujimoto, Satoshi Miura, Aaron Sweeney, Toshihiko Kanazawa, Shigeru Nakao, Shin Ichi Sakai, John A. Hildebrand, C. David Chadwell

研究成果: Article査読

抄録

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.

本文言語English
ページ(範囲)e17-e20
ジャーナルearth, planets and space
55
12
出版ステータスPublished - 2003 1 1

ASJC Scopus subject areas

  • 地質学
  • 宇宙惑星科学

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