[aprssig] Terrestrial Threat to GPS Has Now Hit The Manstream Media

[Randy Love]

We'd all love to think it's a joke, but the FCC is giving this some weight..
They're very close to signing off on it, then Lightsquared won't be jammers,
they'd be licensees interfering with Part 15 devices ( civilian GPS
receivers ) and we'd have no recourse. Don't think so, read the Part 15
rules...

Randy
WF5X

On Sun, Apr 10, 2011 at 1:52 PM, Bernard Van Haecke <
bernard.vanhaecke at gmail.com> wrote:

> This is a non issue unless the jammer is sitting on a sat or airplane.
>
> If terrestrial and uses high power, he will be DF'ed in no time.
>
> Otherwise, this story is a joke.
>
> Bernard
>
> Sent from my EVO android phone
> On Apr 10, 2011 10:44 AM, "Alex Carver" <kf4lvz at yahoo.com> wrote:
> >
> >> From: "Rahn Abbott"
> >>
> >> Ummmm, you do know that that US Military GPS units and your
> >> Garmin Etrex are
> >> not listening to the same radio signals right? You do know
> >> military and US
> >> government GPS runs on a completely different system?
> >
> >
> > No, the military listens to both L1 at 1.57542 GHz (the "civilian" GPS
> signal) and L2 at 1.22760 GHz, the military-only GPS signal. They use both
> signals in order to determine delays caused by the ionosphere which improves
> the accuracy of the military GPS receivers. If interference is caused to the
> L1 signal it will affect both civilian and military users.
> >
> > A military GPS receiver and a civilian GPS receiver both listen to L1 but
> they each use a different chipping code (civilian uses unencrypted C/A and
> military uses both unencrypted C/A and encrypted P). Only the military GPS
> receiver listens to L2 at the same time.
> >
> > Later on there will be new codes (L1C and M) as new satellites are put in
> orbit but they will still have both civilian and military codes sitting on
> L1. In addition, civilians will soon have access to L2 in the form of a
> civilian code on L2 (L2C) which will allow for some basic ionospheric
> corrections to improve accuracy and reduce drift. It won't be as accurate as
> the military receivers but better than the current L1-only receivers.
> >
> > _______________________________________________
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>
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