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Topic Area: Time and Frequency

Displaying records 11 to 20 of 53 records.
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11. 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

12. 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

13. An IEEE 1588 Time Synchronization Testbed for Assessing Power Distribution Requirements
Topic: Time and Frequency
Published: 9/29/2010
Authors: Julien Marc Amelot, Jeffrey Fletcher, Dhananjay Anand, Clement Vasseur, YaShian Li-Baboud, James Moyne
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907050

14. 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

15. The Development of a Unified Time and Frequency Program in the SIM Region
Topic: Time and Frequency
Published: 9/1/2010
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero
Abstract: The Sistema Interamericano de Metrologia (SIM) is one of five major regional metrology organizations (RMOs) recognized by the Bureau International des Poids et Mesures (BIPM). SIM is composed of the national metrology institutes (NMIs) located in th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906191

16. Measurement and real-time cancellation of vibration-induced phase noise in a cavity-stabilized laser
Topic: Time and Frequency
Published: 8/30/2010
Authors: Michael J. (Michael) Thorpe, David R Leibrandt, Tara Michele Fortier, Till P Rosenband
Abstract: We demonstrate a method to measure and actively reduce the coupling of vibrations to the phase noise of a cavity-stabilized laser. This method uses the vibration noise of the laboratory environment rather than active drive to perturb the optical cav ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905732

17. yocto-Newton force detection sensitivity using trapped ions
Topic: Time and Frequency
Published: 8/22/2010
Authors: Michael J. Biercuk, Joseph Wright Britton, Hermann Uys, Aaron Vandevender, John J Bollinger
Abstract: Recent experimental advances have shown that it is possible to detect forces arising from electric fields at a level of aN/ {square root}Hz (atto {math equal} 10^u-18^ through coupling of micro or nanofabricated mechanical resonators to a variety of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905329

18. Advances in Coherent Population Trapping for Atomic Clocks
Topic: Time and Frequency
Published: 8/10/2010
Authors: John E Kitching, Vishal Shah
Abstract: We review advances in the field of coherent population trapping (CPT) over the last decade with respect to the application of this physical phenomenon to atomic frequency references. We provide an overview of both the basic phenomenon of coherent pop ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904870

19. A NIST Disciplined Oscillator
Topic: Time and Frequency
Published: 7/26/2010
Author: Michael A Lombardi
Abstract: The National Institute of Standards and Technology (NIST) now offers a service that provides customers with an oscillator locked to UTC(NIST), the United States national standard for frequency and time. A NIST disciplined oscillator (NISTDO) works by ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905719

20. Challenges in SIM to Create a Coordination Program for Time and Frequency
Topic: Time and Frequency
Published: 7/26/2010
Authors: J. Mauricio Lopez-Romero, Michael A Lombardi
Abstract: The Sistema Interamericano de Metrologia (SIM), one of the world s five major regional metrology organizations (RMOs) recognized by the Bureau International des Poids et Mesures (BIPM), is comprised of national metrology institutes (NMIs) located in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905720



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