[time-nuts] Re: Project Great

[Lux, Jim]

On 11/28/21 8:03 PM, Tom Van Baak wrote:
> Jim,
>
> For state of the art numbers and plots, here's a recent (2020) paper:
>
> "A Review of Contemporary Atomic Frequency Standards",
> by Bonnie Schmittberger, David Scherer
> https://arxiv.org/abs/2004.09987
> https://arxiv.org/pdf/2004.09987.pdf
>
> It also has plots comparing clock stability vs. size and vs. power. 
> Highly recommended reading.
>
> There is also a power point version with similar content as the paper:
>
> https://www.gps.gov/cgsic/meetings/2019/scherer.pdf
>
> /tvb
>
>
> On 11/28/2021 2:05 PM, Lux, Jim wrote:
>> Speaking of which, does anyone have a link to a "current state of the 
>> art" graph. 
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Awesome, these are a good start.

It's nice to have a figure to put in to reports and presentations.  
(Larry Young, recently retired from JPL who is a GNSS guru, had a hand 
drawn graph that he'd update over the years pasted into his notebook)

DSAC is shown as 10 liters (which is about how big it actually is) - I 
remember when John Prestage was talking about the 1 liter atomic clock 
more than 10 years ago, but that's the size of the physics package on 
the bench, and comparing to USOs.  That was before it was "flight ready".