| GPS Block IIF Rubidium Frequency Standard Life Test |
Nov 2009 |
9 pages |
| Authors:
F Vannicola; R Beard; J White; K Senior; T Kubik; D Wilson; J Buisson; NAVAL RESEARCH LAB WASHINGTON DC
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 | Since August 2008, two production PerkinElmer Rubidium Frequency Standards (RFS) built for the GPS Block IIF satellites have been under test at the Naval Research Laboratory (NRL) Precision Clock Evaluation Facility (PCEF). NRL, in conjunction with the GPS Wing, GPS Block IIF prime contractor Boeing, and the RFS manufacturer PerkinElmer, is conducting a minimum 3-year life test on the GPS IIF RFS units, serial numbers 5 and 25. The primary ... |
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| CANVAS: Clock Analysis, Visualization, and Archiving System A New Software Package for the Efficient Management of Clock/Oscillator Data |
Aug 2005 |
6 pages |
| Authors:
K Senior; R Beard; J White; NAVAL RESEARCH LAB WASHINGTON DC SPACE APPLICATIONS BRANCH
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| Few software packages exist which address the particular needs of the time and frequency community in analyzing and simulating clocks or oscillators. None is open source. We offer the source code for a set of tools which aims to incorporate commonly used clock analysis and simulation algorithms. The goal of this release is to promote further development of the package by distributing the effort. |
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| NRL Analysis of GPS On-Orbit Clocks |
Jan 2005 |
8 pages |
| Authors:
J Oaks; K Senior; M Largay; R Beard; James Buisson; NAVAL RESEARCH LAB WASHINGTON DC SPACE APPLICATIONS BRANCH
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| The U.S. Naval Research Laboratory NRL has collected data and analyzed GPS space vehicle atomic clock performance since the beginning of the GPS Program. These analyses have largely been based on pseudorange observations and precise post-fit ephemerides provided by the National Geospatial-Intelligence Agency NGA. Observational data and clock comparisons were limited to data collected within the GPS system due primarily to the lack of global tracking resources and effective means ... |
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| Calibration Considerations for the IGS/BIPM Pilot Time Transfer Project Using Carrier Phase |
Dec-1998 |
12 pages |
| Authors:
J White; R Beard; O J Oaks; J Brad; NAVAL RESEARCH LAB WASHINGTON DC
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| During the spring of 1998 a pilot project was begun between the Bureau International des Poids at Mesures (BIPM) and the International GPS Service (IGS) to investigate the accuracy of time and frequency comparisons using GPS phase and code measurements. The IGS has established a cooperative network of stations around the world which gather GPS data, analysis centers that provide analysis products from these GPS data and other contributed data. ... |
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| Two-Way Satellite Time Transfer (TWSTT) Applications with the Eastern Range |
Dec-1998 |
14 pages |
| Authors:
I Galysh; D Koch; R Beard; NAVAL OBSERVATORY WASHINGTON DC
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| The Eastern Range at Cape Canaveral, as part of the Range Modernization program, is incorporating Two-Way Satellite Time Transfer (TWSTT) systems into their stations. A detailed study of the mechanization of TWSTT into their systems had been performed and an experiment into different satellite links has been reported before. A design implementation has been completed. Acceptance testing was successfully performed at the Naval Research Laboratory (NRL), including over-the-air testing prior ... |
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| GPS Block IIR Rubidium Atomic Frequency Standard Life Test |
Dec-1998 |
16 pages |
| Authors:
R Beard; W Reid; A Frank; F Danzy; T Myers; J Smathers; S Stebbins; J Brad; J White; J Buisson; NAVAL RESEARCH LAB WASHINGTON DC
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| The rubidium clocks in the GPS Block IIR spacecraft have no previous flight experience, and will be the only atomic clocks used on the Block IIR satellites. The U.S. Naval Research Laboratory (NRL),) in cooperation with the Global Positioning System Joint Program Office (GPS-JPO), the GPS control Segment, Lockheed Martin, ITT , and EC&G, is conducting a three year life-test of two flight qualfied EG&G Rubidium Atomic Frequency Standards (RAFS) ... |
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| Simultaneous Absolute Calibration of Three Geodetic-Quality Timing Receivers |
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10 pages |
| Authors:
J F Plumb; J White; E Powers; K Larson; R Beard; COLORADO UNIV AT BOULDER DEPT OF AEROSPACE ENGINEERING SCIENCES
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| The simultaneous calibration of three geodetic-quality timing receivers is performed with a Global Positioning System (GPS) signal simulator. Internal delays for each receiver are measured as a function of the phase difference between the one pulse per second and 20 MHz clock inputs. A calibration curve for each receiver is derived and the curves are compared. |
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