From: James Harrison
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This is exactly what I've done using the Raspberry Pi (Broadcom ARM
SOC running Linux) and a GPS module with the PPS kernel hook for Linux
GPIO. Still a beginner/aspiring time-nut so I'm not sure on accuracy
(PLL offset jitter suggests ~5-10ms worst-case but I've not looked
much into measuring it yet), but it's an improvement on internet NTP
at least.
(Brief writeup here:
http://www.talkunafraid.co.uk/2012/12/the-ntpi-accurate-time-with-a-raspberry-pi-and-venus638flpx/
- - be gentle, it's my first 'real' timing project!)
James
============================================
James,
You might be interested in my write-up:
http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html
and its performance:
http://www.satsignal.eu/mrtg/performance_ntp.php
I was playing with RasPi-1 today to see whether a different (navigation) GPS
receiver or system configuration would make any difference to the
oscillatory nature of the offset, hence the big step around 11:00 when the
card was restarted after an hour's power down. RasPi-2 with a timing GPS
receiver looks better, and it should have an identical configuration to
RasPi-1 (except that the USB port is being sent data).
Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: [email protected]
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