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.
Proceedings Title: Proceedings of the ION GNSS 2011 Conference
Conference Dates: September 20-23, 2011
Conference Location: Portland, OR
Conference Title: ION GNSS 2011
Pub Type: Conferences
Atomic clock, Cesium, GPS, Laser Cooling