[ntp:questions] xGPS_NMEA / xPPS
Alby VA
albyva at empire.org
Fri Feb 24 12:53:30 UTC 2012
On Feb 24, 6:28 am, TomK <foren... at milwpc.com> wrote:
> GPS PPS is not really flawless. It's reasonably dependable. If you can
> repeat the error, it's almost always software. It looks like the GPS
> lost a fix on at least 3 satellites, so PPS didn't sync. NTP noticed,
> and switched to 'NMEA sentence' time only. Check on satellite fix when
> that happens.
>
> On 02/24/12 05:45, Alby VA wrote:
>
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> > I've watched as my NTP session has gone between normal and falsetick.
> > Anybody want to toss out an idea of why this is happening and the
> > solution to make it stop?
>
> > remote refid st t when poll reach delay
> > offset jitter
> > ==============================================================================
> > -ntp.alaska.edu .GPS. 1 u 69 128 7 127.532
> > 0.581 19.471
> > +utcnist2.colora .ACTS. 1 u 69 128 7 61.424
> > 15.184 16.376
> > *time-a.nist.gov .ACTS. 1 u 70 128 7 16.060
> > 26.839 25.833
> > +tick.usask.ca .GPS. 1 u 75 128 7 106.332
> > 20.798 24.112
> > -cronos.cenam.mx .GPS. 1 u 68 128 7 81.165
> > 1.985 11.542
> > xPPS(0) .PPS. 0 l 13 16 377 0.000
> > 28.105 3.330
> > xGPS_NMEA(0) .GPSb. 0 l 12 16 377 0.000
> > -11.920 5.476
>
> > remote refid st t when poll reach delay
> > offset jitter
> > ==============================================================================
> > +ntp.alaska.edu .GPS. 1 u 75 128 7 127.532
> > 0.581 19.471
> > -utcnist2.colora .ACTS. 1 u 75 128 7 61.424
> > 15.184 16.376
> > -time-a.nist.gov .ACTS. 1 u 76 128 7 16.060
> > 26.839 25.833
> > -tick.usask.ca .GPS. 1 u 81 128 7 106.332
> > 20.798 24.112
> > +cronos.cenam.mx .GPS. 1 u 74 128 7 81.165
> > 1.985 11.542
> > oPPS(0) .PPS. 0 l 3 16 377 0.000
> > 28.630 3.022
> > *GPS_NMEA(0) .GPSb. 0 l 2 16 377 0.000
> > -25.386 12.305
>
> > ** Ignore the low reach. I just restarted ntpd.
>
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Thanks... Next time it happens, I'll check to see if its seeing any
satellites.. Thanks, I didn't think to check that.
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