Development of an Extremely Low Power Radio Station for Generating Standard Time Signal Using NTP

H. Maeno, F. Nakagawa, H. Toriyama, A. Machizawa, T. Iwama, and K. Imamura

Abstract:	Radio controlled watches and clocks and automatically adjust the time by receiving the LF time and frequency standards. These watches are in wide use mainly in U.S.A., Germany, and Japan. In Japan, it is said that more than fifty or sixty million watches have been sold so far. There is, however, a big problem that it is rather difficult to receive radio waves in inappropriate environments such as inside of buildings, undergrounds, and places where electromagnetic noise is predominant and consequently, it is unsuitable to use them in the above places. NICT has developed an extremely low power radio station for radio controlled watches and clocks which disseminates the LF time standard acquired by the NTP server. Radio watches would be available even in unsuitable places such as airports, subway stations, sports stadiums and so forth. In addition, it makes it possible to use Japanese-made radio watches not only in Japan, but in other countries by setting the local time zone.
Published in:	Proceedings of the 43rd Annual Precise Time and Time Interval Systems and Applications Meeting November 14 - 17, 2011 Hyatt Regency Long Beach Long Beach, California
Pages:	459 - 468
Cite this article:	Maeno, H., Nakagawa, F., Toriyama, H., Machizawa, A., Iwama, T., Imamura, K., "Development of an Extremely Low Power Radio Station for Generating Standard Time Signal Using NTP," Proceedings of the 43rd Annual Precise Time and Time Interval Systems and Applications Meeting, Long Beach, California, November 2011, pp. 459-468.
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