-------- In message <20200309222553.e5b65b79daa2ee195cf13...@kinali.ch>, Attila Kinali writes: >On Mon, 09 Mar 2020 13:44:59 +0000 >"Poul-Henning Kamp" <p...@phk.freebsd.dk> wrote: > >> 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 ? > >Please correct me if I'm wrong, but that sounds like a >simplified version of a Kalman filter, with the only >predicted variable being the frequency of the LO.
I think this has many names. Dave Mills called it a FLL - Frequency Locked Loop. I'm not sure a Kalman filter would really do much extra for the basic GPS+(OCXO|RB) case, unless you get advanced and also feed it temperature and air pressure. Once you have more than two references, Kalman makes a lot of sense. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | 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 -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
