Perhaps also of interest: https://ws680.nist.gov/publication/get_pdf.cfm?pub_id=105138
Wayne On Thu, Jun 6, 2019 at 3:15 PM jimlux <[email protected]> wrote: > On 6/6/19 12:36 PM, JULIAN TOPOLSKI wrote: > > Interesting article but no description of the clock. > > > > > https://www.space.com/nasa-atomic-clock-falcon-heavy-launch.html?utm_source=twitter&utm_medium=social&utm_campaign=dlvr.it > > _______________________________________________ > > It's DSAC.. > > https://en.wikipedia.org/wiki/Deep_Space_Atomic_Clock > > an order of magnitude better than a space Rb > an order of magnitude better than a Cassini USO at 1000 second tau > > > > > https://ieeexplore.ieee.org/abstract/document/7437483 > R. L. Tjoelker et al., "Mercury Ion Clock for a NASA Technology > Demonstration Mission," in IEEE Transactions on Ultrasonics, > Ferroelectrics, and Frequency Control, vol. 63, no. 7, pp. 1034-1043, > July 2016. > doi: 10.1109/TUFFC.2016.2543738 > > > https://ieeexplore.ieee.org/document/8304787 > IEEE Trans Ultrason Ferroelectr Freq Control. 2018 Jun;65(6):950-961. > doi: 10.1109/TUFFC.2018.2808269. > Using the Deep Space Atomic Clock for Navigation and Science. > Ely TA, Burt EA, Prestage JD, Seubert JM, Tjoelker RL. > Abstract > Routine use of one-way radiometric tracking for deep space navigation > and radio science is not possible today because spacecraft frequency and > time references that use state-of-the-art ultrastable oscillators > introduce errors from their intrinsic drift and instability on > timescales past 100 s. The Deep Space Atomic Clock (DSAC), currently > under development as a NASA Technology Demonstration Mission, is an > advanced prototype of a space-flight suitable, mercury-ion atomic clock > that can provide an unprecedented frequency and time stability in a > space-qualified clock. Indeed, the ground-based results of the DSAC > space demonstration unit have already achieved an Allan deviation of > 2E-15 at one day; space performance on this order will enable the use of > one-way radiometric signals for deep space navigation and radio science. > > > http://issfd.org/ISSFD_2012/ISSFD23_OD1_2.pdf > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
