Use gps for clock correction
sears at cs.berkeley.edu
Thu Aug 14 19:29:54 CEST 2008
Bastian Muck wrote:
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> GPS would be perfect for updating time, cause the time sent is more
> exact then the times, you can get by any other way. What about ntpd, can
> it handle gps-data?
Yes, with some work:
Does the FR have access to the PPS signal from the GPS chip? That might
get it down to tens of microseconds of clock jitter. :) It looks like
gpsd should work as well. Plus, ntp can fall back on NTP over
GPRS/wifi/usb if it's been a while since the last GPS connection. It
can also set the hardware clock skew so it drifts fewer minutes per day
when there's no network or sky.
I wonder how hard it would be to add GSM time broadcast support to NTP...
> Stefan Schmidt schrieb:
> | Hello.
> | On Thu, 2008-08-14 at 23:48, Matt wrote:
> |> Isn't time available via GSM broadcasts?
> | Sometimes. There is a standard for it, but not all operators have it
> enabled for
> | it. AFAIK no german provider has it for example.
> | If anyone have a provider which has this feature enabled and like to
> develop a
> | patch just let us know.
> | regards
> | Stefan Schmidt
> | -------------------------
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