[time-nuts] Home made GPS disciplined atomic clock

[Francesco Ledda]

There are techniques to remove/eliminate the phase error when the GPS source
comes back on line. If the holdover is entered appropriately, the frequency
error should be small and dependent on the stability of the OCXO.




-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
Behalf Of Bruce Griffiths
Sent: Sunday, January 25, 2009 1:01 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Home made GPS disciplined atomic clock


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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