Measurements System using Drifting Buoy with GPS and Cellular Modem of Tidal Current in an Inland Sea

Hiroki Irie, Nagahisa Mita, Yuji Kamikubo, Ikuo Saito, Katsuhiro Morishita

Abstract:	The Yatsushiro Sea, which is also called the Shirani Sea, is a shallow semi-enclosed inland sea located in a southwestern part of Kyushu in Japan. To the north is the Ariake sea; to the south, the East China Sea. The Yatsushiro Sea is blessed with a good natural environment and is well know as a production center of marine products. The observation of tide is an effective method to investigate environments of the sea. There are several methods to know speed and a direction of tide. It is one of methods to measure a position of drifting objects that floated on the water. The drifting small buoy system with various sensors and a GPS receiver has been developed for a purpose of observing a tide of an inland sea. We explain the result that observed a tide current using the buoy system of improvement type for the Yatsushiro Sea. The reduction of the power consumption makes a battery small for the miniaturization of the second version buoy. Even if it miniaturizes a battery, in order to lengthen use time, the electric device was made to sleep and consumption of a power supply was held down. When the position information on a buoy is used for adjustment of sleep time, the effect of electric power saving is reported. Moreover, a result by the observation of the tidal current, it is shown to the public in the Internet. It is possible to inspect it by a browser of a personal computer or a cellular phone.
Published in:	Proceedings of the 2008 National Technical Meeting of The Institute of Navigation January 28 - 30, 2008 The Catamaran Resort Hotel San Diego, CA
Pages:	935 - 942
Cite this article:	Irie, Hiroki, Mita, Nagahisa, Kamikubo, Yuji, Saito, Ikuo, Morishita, Katsuhiro, "Measurements System using Drifting Buoy with GPS and Cellular Modem of Tidal Current in an Inland Sea," Proceedings of the 2008 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2008, pp. 935-942.
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