Arthur Konovalov wrote:
> Well, due to different reasons I had to obtain GPS 18-5Hz and now ran
> into problems...
> From my point of view 5Hz has 2 differences compared to LVC:
> - PPS (GPGGA and GPRMC too) 5 times per second ( .0, .2, .4, .6, .8 of
> each second) instead of 1
> - UTC timestamp hhmmss.s instead of hhmmss
>
> I tried on PPS-patched Linux kernel (2.6.19-rc2-g02be1c39) and
> nmea-patched ntp-4.2.2p4.
>
>
Hello!
I hope that problem solved now.
Part of ntp's refclock_nmea.c file:
#ifdef HAVE_PPSAPI
/*
* If the PPSAPI is working, rather use its timestamps.
* assume that the PPS occurs on the second so blow any msec
*/
if (nmea_pps(up, &rd_tmp) == 1) {
pp->lastrec = up->tstamp = rd_tmp;
pp->nsec = 0;
}
#endif /* HAVE_PPSAPI */
In case of 5Hz PPS we need millisecons part, commented out row:
pp->nsec = 0;
Regards,
Arthur
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