[time-nuts] GPSDO control loops and correcting quantizationerror
Poul-Henning Kamp
phk at phk.freebsd.dk
Sun Sep 16 13:49:01 UTC 2012
In message <CE93652A-1DA6-48E3-9883-D7616AC24A78 at rtty.us>, Bob Camp writes:
Bob,
There's one thing makes me scratch my head here: Why do you keep
arguing like the timeconstant cannot be changed dynamically ?
I use a very aggresive timeconstants initially, to quickly get the
phase offset under control, and then I ramp up the timeconstant in
order to reduce phase noise of the GPS, until I hit something which
looks like the "Allan-intercept" (as Dave Mills calls it).
It' won't take long time for us to agree that the timeconstant
is a tradeoff between phase and frequency error, but just because
it is called a "timeconstant" doesn't mean we cannot change it.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at 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.
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