On Montag, 9. März 2020 14:44:59 CET Poul-Henning Kamp wrote: > -------- > > 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 ?
This is one of the areas where a GPSDO simulator can be a great tool. BR, Matthias _______________________________________________ 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.
