[ntp:questions] Slow convergence of NTP with GPS/PPS
hal-usenet at ip-64-139-1-69.sjc.megapath.net
Fri Oct 24 18:31:27 UTC 2008
>My own experience suggests that, at least with a hand-held GPS, it can be
>a lot longer than 45 seconds. That figure may only apply if the GPS has a
>180-degree clear view of the sky. But the GPS18 LVC does usually recover
>quickly enough (mine has a less than 180-degree sky FoV).
The 45 second number if probably marketing. I'm not sure
how to translate that into reality.
I wouldn't be surprised if older units took a lot longer.
>If we accept 45s, is that shorter than the typical system boot time from
>cold? Could the system boot be delayed enough so that the GPS was
>guaranteed to be ready by the time it was needed?
With a bit of work, you can boot in much less that 45 seconds.
These are my opinions, not necessarily my employer's. I hate spam.
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