[time-nuts] Disciplining a Cs beam standard (was: Why discipline Rubidium oscillator?)

Attila Kinali attila at kinali.ch
Tue Nov 21 08:32:27 EST 2017

On Mon, 20 Nov 2017 20:18:18 -0500
Bob kb8tq <kb8tq at n1k.org> wrote:

> You can (or course) do a GPS disciplined Cs standard. That’s not easy to do, 
> but some are attempting it ….

It is actually quite easy. You measure the satellite carrier and code
phases relative to the output signal of the Cs, collect all the data,
wait a couple of weeks until the IGS final product becomes available,
then you calculate the frequency and phase difference and steer the
Cs accordingly using a control loop with a tau in the order of 3 weeks
at minimum (due to the delay in IGS data), rather 10 to 50 weeks.

Simple, right? :-)

			Attila Kinali
It is upon moral qualities that a society is ultimately founded. All 
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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