[time-nuts] GPS jumps of -13.7 us?

Tom Van Baak tvb at LeapSecond.com
Tue Jan 26 11:42:40 EST 2016


The GPSCon "International Z3801A web plot" page is still active:

http://www.realhamradio.com/GPS_websites_list.htm

Most of the entries are stale but here's a few that show the recent glitch nicely:

http://www.shaunmerrigan.info/timeandfreq/gpscon/gpsstat.htm
http://www.shaunmerrigan.info/timeandfreq/gpscon1/gpsstat.htm
http://www.shaunmerrigan.info/timeandfreq/gpscon2/gpsstat.htm

/tvb

----- Original Message ----- 
From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>; "Paul Boven" <p.boven at xs4all.nl>
Sent: Tuesday, January 26, 2016 8:32 AM
Subject: Re: [time-nuts] GPS jumps of -13.7 us?


> --------
> In message <56A78CE9.20200 at xs4all.nl>, Paul Boven writes:
> 
>>Has anyone else seen GPS time jump by -13.7 usec today?
>>I just heard from several geographically quite distributed radio 
>>observatories that they have seen their GPS receiver(s) jump compared to 
>>their in-house standards.
> 
> Here is a quick plot:
> 
> http://phk.freebsd.dk/misc/20160126_gps.svg
> 
> The two receivers see the same (number of) satelites, but the jumps
> happen at widely different times.
> 
> Magnitude around 14 microseconds seems confirmed.
> 
> These are both Oncore timing receivers.
> 
> 
> -- 
> 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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