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Topic Area: Time and Frequency

Displaying records 31 to 40 of 53 records.
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31. Distributing UTC(NIST) to Industrial Time and Frequency Users
Topic: Time and Frequency
Published: 11/18/2009
Authors: Michael A Lombardi, Victor Shufang Zhang
Abstract: The National Institute of Standards and Technology (NIST) maintains one of the world s most accurate and stable time scales, UTC(NIST), as well as the NIST-F1 cesium fountain, the primary frequency standard for the United States. These standards are ...

32. Limits on GPS Carrier Phase Time Transfer
Topic: Time and Frequency
Published: 11/16/2009
Author: Marc A Weiss
Abstract: The stability of differential delays between Global Navigation Satellite receivers is critical for time and frequency transfer. We study the limit of this transfer between two specific receivers from the study of data taken from these receivers whil ...

33. Novel, All-Digital Phase Measurement System for Time Scales
Topic: Time and Frequency
Published: 11/16/2009
Authors: Stefania Romisch, Thomas Edward Parker, Steven R Jefferts
Abstract: A novel, all-digital phase measurement system, to be utilized as part of the NIST Time Scale at NIST in Boulder, CO is presented. The system is used to compare output signals from several commercial atomic frequency standards: the phase differences ...

34. Phase-lock Loops in Vibration Environments
Topic: Time and Frequency
Published: 11/16/2009
Authors: Archita Hati, Craig W Nelson, David Allan Howe
Abstract: A popular scheme for achieving low phase noise across a large range of offset frequencies is to employ an oscillator at an output frequency with low far-from-carrier noise that is phase-locked to a reference that has low close-to-carrier noise. We i ...

35. Two-Way Satellite Time and Frequency Transfer Using 1 MChip/S codes
Topic: Time and Frequency
Published: 11/16/2009
Authors: Victor Shufang Zhang, Thomas Edward Parker, Demetrios Matsakis, Joseph Achkar, Daniele Rovera, Dirk Piester, Andreas Bauch, Luca Lorini
Abstract: The Ku-band transatlantic and Europe to Europe two-way satellite time and frequency transfer (TWSTFT) operations used the 2.5 MChip/s pseudo-random codes with 3.5 MHz bandwidth until the end of July, 2009. The cost of TWSTFT operation is associated w ...

36. Optical frequency stabilization of a 10 GHz Ti:sapphire frequency comb by saturated absorption spectroscopy in 87Rubidium
Topic: Time and Frequency
Published: 11/4/2009
Authors: Dirk Heinecke, Albrecht Bartels, Tara Michele Fortier, Danielle Braje, Leo Hollberg, Scott A Diddams
Abstract: The high power per mode of a recently-developed 10 GHz femtosecond Ti:sapphire frequency comb permits nonlinear Doppler-free saturation spectroscopy in 87Rubidium with a single mode of the comb. We use this access to the natural linewidth of the Rub ...

37. WWVB Radio Controlled Clocks: Recommended Practices for Manufacturers and Consumers (2009 edition)
Series: Special Publication (NIST SP)
Report Number: 960-14-09
Topic: Time and Frequency
Published: 9/8/2009
Authors: Michael A Lombardi, Andrew N Novick, John P Lowe, Matthew J Deutch, Glenn K Nelson, Douglas D Sutton, William C Yates, D. Wayne Hanson
Abstract: Radio controlled clocks represent a true revolution in timekeeping. Clocks that synchronize to NIST radio station WWVB now number in the millions in the United States, and new sales records are being established every year. As a result, many of us a ...

38. Establishment of the SIM Time Scale
Topic: Time and Frequency
Published: 8/1/2009
Authors: J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, Michael A Lombardi
Abstract: The SIM time and frequency metrology working group has developed a comparison network for the Americas, with the goals of improving metrology in the SIM region and to allow as many countries as possible to participate in the network. As of May 2008, ...

39. The global positioning system, relativity, and extraterrestrial navigation
Topic: Time and Frequency
Published: 4/27/2009
Author: Neil Ashby
Abstract: Relativistic effects play an important role in the performance of the Global Positioning System (GPS) and in world-wide time comparisons. The GPS has provided a model for algorithms that take relativistic effects into account. In the future explorati ...

40. The SIM Time Network and its Contributions to Metrology in the Americas
Topic: Time and Frequency
Published: 4/1/2009
Author: Michael A Lombardi
Abstract: The SIM Time Network (SIMTN) has been one of the great success stories of the Sistema Interamericano de Metrologia (SIM), a regional metrology organization (RMO) that includes the 34 member nations of the Organization of American States (OAS). The S ...

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