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

reportActive / Technical Report | Accession Number: ADA484648 | Open PDF

Abstract:

The U.S. Naval Observatory USNO has provided timing for the Navy and the Department of Defense 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 USNOs realization of Coordinated Universal Time UTC, which has stayed within 5 ns RMS of UTC since 1999. The data used to generate UTC USNO are based upon 73 cesium and 20 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. The USNO would not be able to meet all the requirements of its users had it kept to the same technology it had 10 years ago this paper will describe some of the changes being made to meet the anticipated needs of our users for precision, accuracy, and robustness. Further details and explanations of our services can be found on-line at httptycho.usno.navy.mil, or by contacting the author directly.

Author(s):
Matsakis, Demetrios
Author Organization(s):
NAVAL OBSERVATORY WASHINGTON DC TIME SERVICE DIV
Descriptive Note:
Conference paper
Supplementary Note:
See also ADM001784. Presented at Annual Precise Time and Time Interval (PTTI) Systems and Applications Meeting (34th), held in Washington, DC, on 7-9 Dec 2004. The original document contains color images.
Pagination:
0015

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Monitor Series:
USNO-TS
 Subject Terms
Joint Capability Areas:
JCA_6_Net Centric; JCA_6.4.1_Secure Information Exchange; JCA_4.7.2_Installation Services; JCA_4.7_Base and Installations Support; JCA_6.1.1_Wired Transmission; JCA_6.1.3_Switching and Routing; JCA_6.1_Information Transport; JCA_4.6.1_General Engineering; JCA_4.6_Engineering; JCA_6.4_Information Assurance; JCA_5_Command and Control; JCA_5.3_Planning; JCA_8_Building Partnerships; JCA_4.1_Deployment and Distribution; JCA_3.2_Engagement; JCA_3_Force Application; JCA_8.2_Shape
Modernization Areas:
Space
Communities of Interest:
Space
Descriptor(s):
*NETWORKS, *TIME STANDARDS, CLOCKS, LORAN, MODEMS, TELEPHONE SYSTEMS, COMMUNITIES, DEPARTMENT OF DEFENSE
Field(s)/Group(s):
Computer Systems Management and Standards, Test Facilities, Equipment and Methods
Keyword(s):
UTC(COORDINATED UNIVERSAL TIME), MC(MASTER CLOCK), NTP(NETWORK TIME PROTOCOL)
Report Date:
2004 Dec 01
Creation Date:
2008 Aug 20