著者

Akira ASADA Tetsuichiro YABUKI

出版者

日本学士院

雑誌

Proceedings of the Japan Academy, Series B (ISSN:03862208)

巻号頁・発行日

vol.77, no.1, pp.7-12, 2001 (Released:2006-10-17)

参考文献数

13

被引用文献数

14 51

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This paper reports the activity in the development of the observation system of seafloor crustal deformation for understanding mechanism of interplate earthquakes at subduction plate boundaries around Japan. Currently, the method for the seafloor geodesy is under development in order to overcome several difficulties. The position of the sea-bottom transponders at the vicinity of the Nankai trough and the Japan Trench is observed using a GPS/Acoustic measurement system. Early results from processed data show a scatter of 4cm standard deviation for repeated horizontal positioning from drifting survey vessel. This paper describes two techniques developed to realize precise acoustic ranging, automatically detecting and correcting the Doppler-shift of acoustic propagation signal due to ship's drifting and attitude motion, and theoretically forming a pulse of one wavelength in cross correlation between transmission and reception of long-coded signals.

著者

Kei Fujisawa Akira Asada

出版者

一般社団法人 日本音響学会

雑誌

Acoustical Science and Technology (ISSN:13463969)

巻号頁・発行日

vol.36, no.5, pp.438-440, 2015 (Released:2015-09-01)

参考文献数

11

被引用文献数

2