Introduction of 10 Hz GPS receiver for the improved observation of seafloor crustal movement

Yukihito Osada, Tomoko Mizukami, Motoyuki Kido, Yusaku Ohta, Hiroaki Tsushima, Satoshi Miura, Hiromi Fujimoto

Research output: Contribution to journalArticlepeer-review

Abstract

We have developed a GPS/Acoustic observation system to monitor seafloor crustal movement. This observation has two error sources: one is a long period spatial-temporal variation in the sound speed structure in the ocean, and the other is short period errors in the estimated GPS antenna positions caused by limited sampling rate of Kinematic GPS. We here focus on the latter problem. We test the effectiveness of a 10 Hz GPS receiver on the positioning of the acoustic transducer on the buoy. The difference of the position of the transducer estimated from the 1 Hz GPS receiver and that from the 10 Hz QPS receiver was ∼3 cm. horizontally and ∼2 cm vertically, respectively. The towed buoy from the ship sways with an average frequency of 0.7 Hz or less judging from the attitude data. The sampling frequency of 2 Hz or higher is necessary to accurately monitor the antenna position. It was confirmed that the 10 Hz GPS receiver could reduce the short period error in the transponder's position. The high sampling GPS positioning is useful also for the reduction of the various period variations.

Original languageEnglish
Pages (from-to)141-151
Number of pages11
Journaljournal of the geodetic society of japan
Volume54
Issue number3
Publication statusPublished - 2008 Nov 26

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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