[amsat-bb] Re: Galileo / US GPS
n4hy at idaccr.org
Wed Sep 20 13:41:38 PDT 2006
joseph Murray wrote:
>What will happen if the Galileo goes up is that no European airport will
>allow a commercial jetliner to land without the Galileo system. This
>will inevitably lead to this basic system being in world wide use for
>Does this imply that all airliners going to and from EU and US
>will have to have both Global positioning system ? ( Galileo and the US
> It would appear that the country to which an aircraft is approaching
>could demand a specific space navigetion syetem to be used.
>As I understand the current Galileo event :
>It is in test phase.
>No actual system funding has been established.
>No list of users have been verified to be real supporters.
>The use of the US GPS system does not cost the EU anything.
>All EU users of the current US GPS system will need both if there is no
>global support for a single system
>Without a Amateur satellite using a mode L up link that uses narrow
>and/or wide band digital modulation ( which could change over time ) the
>testing is not really testing for amateur interference.
We COMPLETELY agree that this is essentially the state of affairs. That
said, we can only ASSUME the Europeans mean to do exactly what they say
they will do in building the Galileo system. Given that this is the
only safe assumption we can make, we do not wish to spend millions of
dollars on a satellite system designed to be in operation well into the
currently proposed early days of Galileo where our principal payloads
demand the use of L band.
Anyway, the arguments about this are all based on NONEXISTENT
CONDITIONS. We cannot use L band for the ACP (CC-Rider) in my
opinion. I see no reason at this time why we cannot fly an L band
receiver for the linear transponders. I have already asked John
Stephensen to design one and he has AGREED to do it. Why are we arguing
over a non issue? I believe L band can be accomodated on Eagle but
before I write it in blood, I want Jim's team to do an analysis that
shows we can fit it along with our primary payload antennas on the space
Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540
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