NASA's Deep Space Atomic Clock test mission is moving toward a late-2017 launch (don't all projects slip?). The DSAC was just integrated with the spacecraft. The clock uses a ~40.5 GHz hyperfine transition of mercury ions. This steers an ovenized crystal USO (Ultra Stable Oscillator) from FEI with 1-100 sec stability <2e-13 and drift <1e-10/day. A GPS receiver is also on board: https://www.jpl.nasa.gov/news/news.php?feature=6784
NASA information about the DSAC applications at: https://www.nasa.gov/mission_pages/tdm/clock/index.html Expected DSAC performance (2014 paper). This paper claims an estimated Allan Deviation of <1e-14 (perhaps 3e-15) at a one day interval when in space: https://www.researchgate.net/publication/260036335_Expected_Performance_of_the_Deep_Space_Atomic_Clock_Mission Here are the latest two papers I can find (from Feb 2016): ** Deep Space Atomic Clock Technology Demonstration Mission Onboard Navigation Analog Experiment: https://www.researchgate.net/publication/293648952_Deep_Space_Atomic_Clock_Technology_Demonstration_Mission_Onboard_Navigation_Analog_Experiment ** Preliminary Investigation of Onboard Orbit Determination using Deep Space Atomic Clock Based Radio Tracking: https://www.researchgate.net/publication/293648187_Preliminary_Investigation_of_Onboard_Orbit_Determination_using_Deep_Space_Atomic_Clock_Based_Radio_Tracking -- Bill Byrom N5BB ----- Original message ----- From: Gregory Beat <w...@icloud.com> To: time-nuts@febo.com Subject: [time-nuts] True Time Nut Mission: NASA's Deep Space Atomic Clock (DSAC) Date: Tue, 12 Jan 2016 17:31:26 -0600 Upcoming Event: Deep Space Atomic Clock Jan. 14, 2016, at 7 p.m. PT (10 p.m. ET, 0300 UTC) You can watch this event via USTREAM: http://www.ustream.tv/NASAJPL2 Speakers: Todd Ely, DSAC Principal Investigator, JPL Allen H. Farrington, DSAC Project Manager, JPL http://www.nasa.gov/mission_pages/tdm/clock/clock_overview.html#.VpWMgK9OKK0 Atomic clocks are an integral, yet almost invisible component of modern life. For space exploration, they have been the foundational frequency standard for NASA's Deep Space Network. NASA's Deep Space Atomic Clock (DSAC) Technology Demonstration Mission, led by the Jet Propulsion Laboratory, has been maturing the latest Atomic Clock technologies into a smaller package, suitable for installation on a variety of deep space probes to enhance navigation precision and gravity science across the solar system. ============ DSAC is scheduled for launch in mid-2016. Satellite being built by Surrey Satellite Technologies USA, Englewood, CO Sent from iPad Air _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.