[ntp:questions] Re: Effect of Antenna Cable Delay

Paul Croome Paul.Croome at softwareag.com
Mon Sep 29 08:35:05 UTC 2003

Dale Worley <worley at dragon.ariadne.com> wrote in message news:<87d6dmotra.fsf at netnews.comcast.net>...
> hmurray at suespammers.org (Hal Murray) writes:
> > How much does the atmospheric delay change?  Is there any way
> > to correct for that?  (Say by using the outside temperature,
> > or the time of day.)
> My guess would be that the most important part of the delay would be
> in the ionosphere, which is a thin plasma, and probably interacts
> fairly strongly with EM radiation.  But the ionosphere changes
> depending on the time of day, where you are in the solar cycle, etc.
> But other than the daily cycle, it would be hard to get adequate
> information to correct for the delay, I'd think.
> Dale

Measuring and then disseminating corrections for ionospheric delay
is one of the goals of the EGNOS programme. See


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