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Topic Area: Time and Frequency
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Displaying records 31 to 40 of 53 records.
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31. NIST Time and Frequency Services
Series: Special Publication (NIST SP)
Report Number: 432
Topic: Time and Frequency
Published: 1/1/2002
Author: Michael A Lombardi
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=105432

32. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904665

33. On-Board GPS Clock Monitoring for Signal Integrity
Topic: Time and Frequency
Published: 11/15/2010
Authors: Marc A Weiss, Pradipta Shome, Ron Beard
Abstract: Navigation signal integrity is paramount for aviation and safety of life services. Hitherto GPS signal anomaly alerting has been provided primarily by ground based augmentations. Significantly improved navigation signal integrity and quality may be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907478

34. On-Board Signal Integrity for GPS
Topic: Time and Frequency
Published: 9/21/2010
Authors: Marc A Weiss, Pradipta Shome, Ron Beard
Abstract: The elements of a space-based integrity approach are to monitor the signals on-board the satellite, such that signal performance can be maintained well within desired integrity limits. These elements include 1) a system for monitoring multiple atomi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906614

35. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903059

36. Phase noise suppression in frequency comb generators
Topic: Time and Frequency
Published: 6/2/2010
Authors: Craig W Nelson, Archita Hati, J F Nava-garcia, David Allan Howe
Abstract: We propose an idea to suppress the flicker (1/f) noise in radio frequency (RF) multiplier based frequency comb generators. Comb generators are often used for frequency multiplication in frequency synthesis. In general, comb generators apply high powe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905992

37. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904373

38. SIM time scales
Topic: Time and Frequency
Published: 10/27/2010
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz
Abstract: This paper presents an analysis of the performance of some of the time scales generated in the Sistema Interamericano de Metrologia (SIM) region. We emphasize the generation of the first international time scale in near real time, the SIM Time scale ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906268

39. Searching for applications with a fine-toothed comb
Topic: Time and Frequency
Published: 4/1/2011
Author: Nathan Reynolds Newbury
Abstract: Frequency combs, like many ground-breaking technologies, are simple in concept; they results from the spectrum of any regular train of optical pulses. What is remarkable is that this simple picture can be actually realized in a number of different ex ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907915

40. Stopwatch and Timer Calibrations (2009 edition)
Series: Special Publication (NIST SP)
Report Number: 960-12
Topic: Time and Frequency
Published: Date unknown
Authors: Jeff C Gust, Robert M. Graham, Michael A Lombardi
Abstract: Stopwatch and timer calibrations are perhaps the most common calibrations performed in the field of time and frequency metrology. Hundreds of United States laboratories calibrate many thousands of timing devices annually to meet legal and organizatio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=50659



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