[time-nuts] Pre-averaging Phase Data
Poul-Henning Kamp
phk at phk.freebsd.dk
Sat May 2 15:55:19 UTC 2020
--------
In message <4D24832F-8127-411A-8566-973AC6F5D473 at n1k.org>, Bob kb8tq writes:
>In general the way you go from 1 to 10 to 100 seconds is to decimate
>( = throw away) the data to get a phase record at the tau you are after.
The problem with that, is that decimation may _also_ throw away noise.
As a general scientific rule, if you measured, you use the measurements,
you cannot "pick & choose" amongst your measurements, not even if
you do it in a certifiably random way.
As I understand it, that is one of the minor problems the Modified
Allan Variance was (also) supposed to fix ?
--
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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