In article ,
(Yuri Tregubov) wrote:

GPS jammers (noise generators) are the standard tools nowadays.
Obviously, the weak satellite signal could be shutdown quite easily.

Not so obviously.

The directionality of RF, along with the inverse-square law, make it
*much* harder to jam a source that's effectively "behind" the incoming
munitions than you'd think. The jammers have to be quite high powered,
and are therefore pretty easy to find and disable (along with the
problem of keeping the jammers powered for days or weeks at a time).

It's not a top notch, cool technology anymore, just usual (and
probably boring) stuff.

See, http://www.noisecom.com/content/Prod.../GPS7500_5.pdf

You might note, for example, that the testing device above is used to
determine if *internal* RF noise interferes with GPS function (if a cell
phone or car mounted GPS is degraded by RF in the same vehicle).

It takes a lot of power to do anything to a GPS signal at anything like
a reasonable range.

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