-------- In message <[email protected]>, Matthias Welwarsky writes:
>> Backing up a bit …. the objective is not to minimize overshoot or >> keep the loop from oscillating. The issue here is optimizing the noise >> output of the combination of GPS + OCXO when combined via >> the control loop. It’s a very different objective …. > >Absolutely. The GPS will introduce a ton of noise and the objective for the >control loop is mainly to keep the influence of this noise away from the GPSDO >output for small tau. You want the GPS only have an influence for large tau, >ideally only countering the aging of the LO. Has anybody ever played seriously with separate frequency and phase adjustments ? I'm thinking 24h (to minimize GPS periodicities) frequency measurement and adjustment, with a continuous very weak proportional phase adjustment to come with measurement noise and rounding errors ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
