[ntp:questions] NMEA Jitter

David Woolley david at ex.djwhome.demon.co.uk.invalid
Fri May 2 21:31:51 UTC 2008


Venu Gopal wrote:
> Hi all,
> 
> Its time that I stop scratching my head with this issue :-D  
> 
> I have been working with ublox-Antaris Evalkit (borrowed from a friend).
> This GPS receiver spits NMEA sentences, UBX (ublox binary messages)
> and gives PPS. Very good...so configured NTP with NMEA driver. At times
> it is observed that a shift of -1 second appears and continues for a day 
> or more
> before it comes back to proper time.

Use the fudge command to move the NMEA error band so that it falls 
entirely within the correct PPS second.  If the NMEA error band exceeds 
one second, get a better GPS receiver.
> 
> It is important that these GPS receivers generate NMEA sentences (at 
> least one)
> in sync with the PPS which makes them usable.
> 
> Comments and similar experiences ?
> 
> Venu




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