From: Jeff Woolsey
Not necessarily. Trust but verify your local reference clock against
other servers out there. For example, I'm currently seeing about 60ms
of jitter/offset in the SHM refclock from gpsd managing a SiRF II
device. (It was 10 seconds off before I fixed gpsd not to request
messages it's ignoring anyway.). It's USB, but still I'd expect only
1-2ms of offset/jitter, which is fine for my purposes:
[]
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Are you using PPS? The serial data alone may typically be no better than
Internet servers, and may be worse if you have a good Internet connection.
PPS even over USB will be significantly better. PPS with a direct
connection should be much better - I'm seeing microsecond offsets on my
Raspberry Pi cards with a variety of GPS receivers - all rather low-cost!
Performance:
http://www.satsignal.eu/mrtg/performance_ntp.php
Details:
http://www.satsignal.eu/ntp/Raspberry-Pi-NTP.html
Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: [email protected]
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