[time-nuts] Home made GPS disciplined atomic clock

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sun Jan 25 14:01:29 EST 2009


EWKehren at aol.com wrote:
> Its main purpose was time synchronization. Bert
>
>   
Bert

But time and frequency are dual aspects of the same phenomenon.

The only real concern is the behaviour of the Thunderbolt when
recovering from holdover.
There will be transient time (phase ) and frequency excursions.
One can either allow a jam sync for fast correction of any accumulated
time error or disable it and accept the potentially larger frequency
excursions as the disciplining loop locks the PPS output to GPS time.

Performance during holdover depends on whether the Kalman filter has
accumulated sufficient information to correct for drift tempco and other
predictable errors during holdover.

Bruce





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