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ISSN 2083-6473
ISSN 2083-6481 (electronic version)
 

 

 

Editor-in-Chief

Associate Editor
Tomasz Neumann
 

Published by
TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
www http://www.transnav.eu
e-mail transnav@am.gdynia.pl
The Basic Research for the New Compass System Using Latest MEMS
1 Tokyo University of Marine Science and Technology, Tokyo, Japan
ABSTRACT: This paper demonstrates basic research for a new compass system using latest MEMS (Micro Electro Mechanical Systems) sensors for small vessels. In 2007, MEMS Electro-statically Gyro (ESG) was introduced by TOKYO KEIKI which is a Japanese company. This sensor accuracy has dramatically improved compared to vibration types. For example, instability has been improved 10 times more than the vibration types. The reproducibility was tested and maximum difference was 0.55 [deg/sec] in the field test. The MEMS-ESG could detect the relative angles as accurate as GPS compass in short term use. Even though sensor accuracy has been improved, an improvement of another 10 times is needed to detect the earth?s turn rate. Because of this a second system is required for a complete compass system. A celestial navigation system is one of the possibilities to complement this. Traditionally the sextant has been used for measuring the altitude, but it has some human errors and difficult to measure continuously. Therefore, it might be useful to get sun altitude and direction automatically. In this thesis, the sun altitude and direction detecting system using camera devices are studied. Using 350?288 resolution camera and a radio-controlled clock, the sun movement was detected 5?14? per pixels and 2?16?. per pixels for the altitude and direction respectively. Although this is a basic research for an integrated system, the data should have an enormous affect upon future research.
REFERENCES
Gen F. & Shogo H., 2008. Basic Research of the MEMS Inertial Navigation Equipment for the Small Vessels, The journal of Japan Institute of Navigation, pp. 213-220
Japan Coast Guard. 2008. Celestial Position Calculation. http://www1.kaiho.mlit.go.jp/KOHO/syoshi/furoku/na09-data.pdf/
David Titterton & John Weston. 2004. Strapdown Inertial Navigation Technology, Edition, pp. 103-105
Shigeru Nakamura. 2008. Development and applications of ESG Gyro Float・Turning type MEMS inertial sensor, 4th Published by the Japanese Committee for Radio Aids to Navigation
Kenji Hasegawa. 1994. Celestial Navigation. Kaibundou
Fabio C. & Eric K. 1995. Robot Localization using a computer Vision Sextant, Robotics Institute, Carnegie Mellon University
Matthew C. D. & David W. & Daniel V., 2005. A Sun Tracker for Planetary Analog Rovers. NASA Ames Research Center, QSS Group Inc., Carnegie Mellon University
Kou N., 1999. Computations of Sunrise and Sunset, Tijin Shokan,P.76
Citation note:
Fukuda G., Hayashi S.: The Basic Research for the New Compass System Using Latest MEMS. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 4, No. 3, pp. 317-322, 2010

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