[ntp:questions] First attempt GPSD/PPS ->NTP time server
Unruh
unruh-spam at physics.ubc.ca
Sun Jan 27 07:29:17 UTC 2008
folkert at vanheusden.com (Folkert van Heusden) writes:
>> The GPS time is not very accurate anyway, and can vary wildly, probably
>> depending on the device, so don't expect perfect offsets. On my Garmin G
>PS
>> 18 LVC, I use 0.190 which gets it in the ballpark, but can randomly jump
>> +16ms to -10ms at any time.
>But if you let ntp handle the pps signal it should be a steady 0.0-0.1ms
>difference as it then knows when this second started:
He was refering solely to the NMEA signal not the PPS. Some GPS receovers
have no pps.
> remote refid st t when poll reach delay offset jit
>ter
>=========================
>=========================
>=========================
>===
>+GPS_NMEA(0) .GPS. 0 l 17 16 376 0.000 -0.001 0.
>001
>oPPS(0) .PPS. 0 l 5 16 377 0.000 -0.001 0.
>001
I am afraid I simply do not believe this. NMEA is lucky to get a ms not a
usec. The offset on the NMEA should be a lot bigger than .001
>Folkert van Heusden
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