In message ,
Harry Andreas writes
In article , "Paul J. Adam"
wrote:
The trouble is, GPS is too damn useful. Mike Marron wrote eloquently
about how a working GPS can replace most of your flight instruments...
as long as the GPS is working. But it's a low-powered signal from orbit
and it's easily jammed. GPS jamming isn't a feature of civilian life,
but it's a serious military problem. GPS offers much more than any other
navaid I've heard of, no wonder people turn to it first.

Oh Bo....ks.
GPS is easy to TRY to jam. Well known signal processing techniques are
all that's required to defeat jamming.

Harry, with GPS you're trying to not only detect a domestic light bulb
in low earth orbit, but to pull useful signal out of it. Doesn't take
much in-band noise to spoil that game, because there isn't much signal
there to start with. Directional aerials, parking beam nulls on the
jammers, games like that help but they also cost money and volume and
weight.


It's not the end of the world if the enemy whips out a few jammers, and
it's harder to do well than some would have you believe, but it's still
a genuine concern with fewer easy answers you suggest.

If there's a cheap, quick, easy and reliable magic bullet to make GPS
unjammable, then hasten down to your patent office at once.

--
When you have to kill a man, it costs nothing to be polite.
W S Churchill

Paul J. Adam MainBoxatjrwlynch[dot]demon{dot}co(.)uk