[ntp:questions] Re: GPS signal quality
Brad Knowles
brad at stop.mail-abuse.org
Wed Nov 10 19:22:11 UTC 2004
At 2:07 PM -0500 2004-11-10, Richard B. Gilbert wrote:
> When GPS does work reliably; e.g. when you have a good quality signal from
> four satellites, your clock can synchronize to within 40 microseconds or
> better.
This is why it can be extremely useful/important to use a GPS
receiver that also includes an OXCO or other type of accurate clock
that can be disciplined by the GPS signal, so that you can continue
in a degraded mode while the GPS signal is not available and yet
still have reasonably good time being delivered to your server.
One example here would be the Meinberg unit.
--
Brad Knowles, <brad at stop.mail-abuse.org>
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
-- Benjamin Franklin (1706-1790), reply of the Pennsylvania
Assembly to the Governor, November 11, 1755
SAGE member since 1995. See <http://www.sage.org/> for more info.
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