Time and Frequency Activities at the U.S. Naval Observatory | Zendy

Demetrios Matsakis | Zendy

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Time and Frequency Activities at the U.S. Naval Observatory

Author(s) -

Demetrios Matsakis

Publication year - 2008

Publication title -

international journal of navigation and observation

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.176

H-Index - 18

eISSN - 1687-6008

pISSN - 1687-5990

DOI - 10.1155/2008/387418

Subject(s) - time transfer , observatory , hydrogen maser , master clock , computer science , telecommunications , satellite , navy , remote sensing , global positioning system , environmental science , electrical engineering , meteorology , engineering , aerospace engineering , maser , physics , geography , astronomy , jitter , archaeology , clock signal

The US Naval Observatory (USNO) has provided timing for the navy since 1830 and, in cooperation with other institutions, has also provided timing for the United States and the international community. Its Master Clock (MC) is the source of UTC(USNO), the USNO's realization of Coordinated Universal Time (UTC), which has stayed within 5 nanoseconds RMS of UTC since 1999. The data used to generate UTC(USNO) are based upon 73 cesium and 21 hydrogen maser frequency standards in three buildings at two sites. The USNO disseminates time via voice, telephone modem, LORAN, Network Time Protocol (NTP), GPS, and two-way satellite time transfer (TWSTT). This paper describes some of the changes being made to meet the future needs for precision, accuracy, and robustness

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