[time-nuts] Pioneering Deep-Space Atomic Clock Taking Flight This Month

[Wayne Holder]

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 <jimlux at earthlink.net> 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
>
>
>
>
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