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If you look into it, there are two possible "disruptions" to GPS:   (a)
simply eliminating the signal by, say, interfering with it or (b)
supplying false signals.   While I'm not sure of countermeasures to this
last one, unless the false signal is very, very sophisticated it's
possible to detect its presence (by, for example, moving 100 yards and
calculating whether the positions of the false satellites agree with the
receiver'a new geographic position).    GPS has been an important
positioning system for the military for over 20 years.   I suspect
they've given a LOT of thought to countermeasures and
counter-countermeasures.

At the same time, if there are public links to these seminars, links to
them would be appreciated.

Apache Runner wrote:
> It makes sense.   I had a student who went into active duty in the Air
> Force post 9/11.   Her job was to figure out a way to disrupt GPS
> using only information available on the web.   Evidently her team
> succeeded brilliantly.  I don't know the details, but she's given some
> seminars on the unclassified parts of the exercise.
>
>
>
> >

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