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

[Ben Bradley]

I just read this on Gizmodo, it surely adds no technical info for this
crowd, but I'm impressed with both how much info it does have, as well
as its correctness for a layman-oriented article:
https://gizmodo.com/why-is-nasa-sending-an-atomic-clock-into-space-1835282558

On Thu, Jun 6, 2019 at 8:00 PM Wayne Holder <wayne.holder at gmail.com> wrote:
>
> 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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