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.
