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Publication Citation: A Laser-Cooled Frequency Standard for GPS

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Author(s): Thomas P. Heavner; Stephan E. Barlow; Marc A. Weiss; Neil Ashby; Steven R. Jefferts;
Title: A Laser-Cooled Frequency Standard for GPS
Published: September 20, 2011
Abstract: NIST is in an initial phase of developing a prototype laser-cooled atomic frequency standard (AFS) for potential use in a future GPS system. The expected fractional frequency stability or Allan deviation, ςy(τ), will be 2x10-13 at one second, improving as the square-root of the averaging time to 7x10-16 at one day. This corresponds to an expected time dispersion of 0.060 ns at one day, or 0.02 m of user range error (URE). We discuss design and development process underway at NIST, as well as capabilities enabled by this AFS in GPS.
Conference: ION GNSS 2011
Proceedings: Proceedings of the ION GNSS 2011 Conference
Pages: pp. 1 - 4
Location: Portland, OR
Dates: September 20-23, 2011
Keywords: Atomic clock,Cesium,GPS,Laser Cooling
Research Areas: Physics