[ntp:questions] Is the time from the GPS receiver bad ?

Eugen COCA ecoca at eed.usv.ro
Sun Sep 10 18:58:26 UTC 2006


>From time to time the ntpq -pe output from my servers looks like this:

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
+GPS_NMEA(1)     .GPS.            0 l   52   64  377    0.000    0.000
 0.004
 ptbtime1.ptb.de .PTB.            1 u   75  256  377  155.060  -48.458
35.782
 ntps1-1.cs.tu-b .PPS.            1 u   91  256  377  151.487  -47.099
 1.731
 ntp-p1.obspm.fr .1PPS.           1 u   11  256  377  123.504  -22.762
19.197
 gps-2.mit.edu   .GPS.            1 u   34  256  377  246.793  -49.433
 3.131
oPPS(1)          .PPS.            0 l    4   16  377    0.000    0.000
 0.004
 ptbtime2.ptb.de .PTB.            1 u   38  256  377  157.004  -47.865
 2.205
 gps-1.mit.edu   .GPS.            1 u   24  256  377  239.559  -38.903
31.765

The question is: is it the time received from the GPS receiver bad ? I
suppose a network problem (upstream delay different from downstream
delay) but how may I bypass this problem - for the moment I have the
noselect for all external servers (without the noselect option the
server will reject the time from the GPS receiver).

Thanks !




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