[time-nuts] Help in Locking a Windows Computer to GPS Time

Hal Murray hmurray at megapathdsl.net
Thu Aug 22 04:01:41 EDT 2013


albertson.chris at gmail.com said:
> NTP will use the "best" reference clocks it finds.  If that is GPS it will
> use that.  It can also use other NTP servers.   Typically people use those
> rather then getting their own GPS receiver.  If the PC has a network
> connection you can likely get time to within a few milliseconds using NTP
> and a few of the pool time servers. 

I think you are missing the big picture.

The OP wanted GPS time.

NTP isn't setup to work with GPS time rather than UTC.

None of the typical low cost GPS/NMEA receivers tell you GPS time rather than 
UTC.  Some of them tell you the offset.

If you really want GPS time, you have two choices.
  One is to get UTC via NTP and the offset via IERS, USNO, and NIST, and 
probably others.
  This has troubles when the leap-second offset changes.

  The other would be to listen to various GPS devices and see if you can get 
GPS time rather than UTC.  It might work to hack various refclock drivers 
distributed with the NTP reference package.





-- 
These are my opinions.  I hate spam.





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