[ntp:questions] Start of new GPS 1024 week epoch

David Malone dwmalone at walton.maths.tcd.ie
Wed Aug 14 09:10:13 UTC 2013


Terje Mathisen <"terje.mathisen at tmsw.no"> writes:

>Nice!

>You've replaced the 1024-week epoch with a +/- 512-week window around 
>the "current" time. :-)

Indeed - ntp already sort of has to do a similar, because the
timestamps are mod 2^32 seconds from 1900, so using a trick like
this is only marginally distasteful ;-)

>> I'm trying to adjust the timestamp given by NMEA might be slow by
>> some multiple of 1024 weeks, and so tries to adjust it so that it
>> is reasonably close to the system time associated with the read of
>> the NMEA data.  I'm not sure if I've got the code exactly bang-on,
>> but it has got ntp running with the unit again.

>Looks good.

On Harlan's recommendation, I've opened a feature request with the
patch. If anyone notices any issues, I can log them there.

	David.



More information about the questions mailing list