[time-nuts] M12+T sawtooth correction and additional filtering

Poul-Henning Kamp phk at phk.freebsd.dk
Wed May 9 05:47:19 UTC 2012


In message <4EBB3F0321D24025B6BA3F4AA81B5134 at pc52>, "Tom Van Baak" writes:

>As long as you're playing with @@Hn messages, Kalman filters,
>and software sawtooth correction, you might want to consider
>looking at the per-SV "fractional GPS local time estimates" in the
>Hn message. It's the mean of these values that determines the
>virtual 1PPS (= the physical 1PPS + sawtooth correction).

See also:
	http://phk.freebsd.dk/raga/sneak/

-- 
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.



More information about the time-nuts mailing list