On Mon, 09 Mar 2020 21:31:00 +0000
"Poul-Henning Kamp" <[email protected]> wrote:
> >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.
Definitely. If you leave out the predictive aspect, then,
for the phase/frequency case of an GPSDO, the loop
formulation becomes a PI loop (unless I misunderstood
someting). If you take frequency drift into account,
it becomes a PII² 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.
Kalman filters are just a formalism to map a system model into
a control loop that predicts the internal states of the model
and gives a more optimal control using this predictive power.
You can map any PID loop back to a Kalman formalism.
Attila Kinali
--
<JaberWorky> The bad part of Zurich is where the degenerates
throw DARK chocolate at you.
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