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You searched on: Topic Area: Time and Frequency Sorted by: title

Displaying records 21 to 26.
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21. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904814

22. The impact of turbulence on high accuracy time-frequency transfer across free space
Topic: Time and Frequency
Published: 6/26/2013
Authors: Laura C Sinclair, Fabrizio Raphael Giorgetta, William C Swann, Esther Baumann, Ian R Coddington, Nathan Reynolds Newbury
Abstract: Atmospheric optical path-length variations are measured across a 2-km optical link through a frequency comb-based system with femtosecond-level precision. Without mitigation, the turbulent piston effect will severely restrict time-frequency trans ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913448

23. Time-domain stabilization of carrier-envelope phase in femtosecond light pulses
Topic: Time and Frequency
Published: 5/7/2014
Authors: Young-Jin Kim, Ian R Coddington, William C Swann, Nathan Reynolds Newbury, Joohyung Lee, Seungchul Kim, Seung-Woo Kim
Abstract: We report a time-domain method of stabilizing the carrier-envelope phase (CEP) of femtosecond pulses. Temporal variations of the pulse envelope and the carrier electric-field phase were separately detected with the aid of intensity cross-correlat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915618

24. Towards a Reconfigurable Distributed Testbed to Enable Advanced Research and Development of Timing and Synchronization in Cyber-Physical Systems
Topic: Time and Frequency
Published: 12/9/2015
Authors: Aviral Shrivastava, J C Eidson, Marc Abbott Weiss, YaShian Li-Baboud, Hugo Andrade, Patricia Derler, Kevin Stanton
Abstract: Timing and synchronization play a key role in advanced cyber-physical systems (CPS). Precise timing, as often required in safety-critical CPS, depends on hardware support for enforcement of periodic measure, compute, and actuate cycles. For general C ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=919696

25. Two-Way Link for Time Interval Comparison of Optical Clocks over Free-Space
Topic: Time and Frequency
Published: 5/11/2012
Authors: Fabrizio Raphael Giorgetta, William C Swann, Ian R Coddington, Esther Baumann, Jean-Daniel Deschenes, Laura C Sinclair, Alexander M. Zolot, Nathan Reynolds Newbury
Abstract: We demonstrate a free-space link for clock comparisons based on the two-way exchange of pulse trains from combs. The residual uncertainty is 5 * 10^17 in 100 seconds over a 120 m air path, with longer distances possible.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911078

26. 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



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