[Boatanchors] LightSquared

[J. Forster]

> The Global Navigation Satellite System, GNSS, *IS* GPS based precision
> navigation.
>
> It provides precise three dimensional location.  LORAN never did that.
> LORAN is *dead*.

Most people DON'T CARE about altitude. Pilots are a tiny minority of GPS
users. And, for geometry reasons, GPS is far less acurate in altitude than
Lat/Long.

The decision to shut off LORAN-C is generally believed to be idiotic, and
politically motivated. GPS is very vulnerable to jamming. GPS jammers are
easily available for $25 that will kill GPS for >1 mile radius.

> LightSquared is NOT nor EVER was GPS.

Nobody ever said it was. Quit with the straw-man arguments.

> It interferes with GPS.  It is a
> broadband wireless carrier.  Read as cell phones and the like.
>
> The DOT, (read FAA), and DoD have pitched a fit over the interference of
> LightSquared with GPS and WAAS.  These combined systems, (WAAS is Wide
> Area Augmentation System.  It provides an airport a very fine level of
> additional GPS data allowing for Zero/Zero landing ability.)
>
> This gives pilots the ability to fly down below MDA and put the nose
> wheel within 6" of the runway center-line.
>
> Some folks don't get it!  LightSquared's view is that GPS "looks into
> their Bandwidth", not that it interferes with it.
>
> They are fighting the FCCs decision!
>
> Bob - N0DGN

No practical, realizable filter has the kind of reaponse needed to
separate the two, especially where the LightSquared is 60 to 120 dB
stronger. Furthermore, a GPS receiver cannot tolerate much insertion loss.

-John

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