Re: U.S. Researchers Crack Codes to ESA's Galileo GPS

[Valdis.Kletnieks () vt edu]

On Sun, 09 Jul 2006 11:56:24 EDT, Jeff Kell said:
> Drsolly wrote:

> > B) if Bush decides that open access helps the "turists" then they'll close
> > it, and we'll be left without a GPS unless we make our own.
> Indeed.  Have we forgotten the civilian GPS "fuzzing" feature they
> disabled in Gulf War I?

I've heard rumor that the US government itself has forgotten about Selective
Availability, and has enough GPS directional nav aids installed in non-combat
gear that if they did it again, they'd be shooting themselves in the foot.

There's been research on how to squawk SA on only those GPS that are
above-horizon in the combat theatre, so elsewhere you always have line-of-sight
to enough sources not doing SA so you can navigate, but I don't know whether
it's current state is deployable or deplorable. ;)

Trivia:  During Gulf War I, we didn't have a full constellation of GPS
orbited yet - and the bombing runs on Baghdad were carefully timed for
those times when at least 5 were above-horizon at the time (most of the
time only 3 or 4 were visible).

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