Centimeter-level positioning on the seafloor

被引：61
作者：
Asada, A
Yabuki, T
机构：
[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan
[2] Japan Coast Guard, Dept Hydrograph, Chuo Ku, Tokyo 1040045, Japan
来源：
PROCEEDINGS OF THE JAPAN ACADEMY SERIES B-PHYSICAL AND BIOLOGICAL SCIENCES | 2001年 / 77卷 / 01期
关键词：
subduction zone; crustal deformation; GPS; acoustic ranging;
D O I：
10.2183/pjab.77.7
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
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 geodes is under development in order to overcome several difficulties. The position of the ea-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 4 cm standard deviation for repeated horizontal positioning from drifting survey vessel. This paper describes tow 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.
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页码：7 / 12
页数：6
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