[time-nuts] GPS discipline oscillator vs phase lock
attila at kinali.ch
Sun Jun 18 10:10:01 EDT 2017
On Sat, 17 Jun 2017 06:29:02 -0700
jimlux <jimlux at earthlink.net> wrote:
> Well, at JPL we regularly lock two crystal oscillators together that are
> over a billion km apart with added Allan deviation of less than 1E-15 at
> 1000 seconds with a radio link at 7.15 GHz. It's how we measure the
> distance and velocity to spacecraft (a few cm in range and mm/s in
> velocity) and from that figure out the gravitational fields (among other
This sounds interesing. What do I have to google for to learn more?
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the prosperity and technological sophistication in the world is of no
use without that foundation.
-- Miss Matheson, The Diamond Age, Neil Stephenson
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