"Paul J. Adam" wrote in message ...
In message , Al Dykes
writes
In article ,
Paul J. Adam wrote:
Let's split the difference and say it got lost somewhere along the way.
(Otherwise, why would CCM against GPS jammers be a profitable business,
if the system was inherently resistant?)

Some creative Russian printed up some ACME GPS Jamming System
brochures and took SH for some of his money ?

Elements of that. Basic GPS systems, civilian and some military, are
very easily sent berserk by low jamming powers. Less basic systems are
more resistant, increasing (for rising input cost) to very jam-proof
systems that are extremely difficult to lock out.

GPS jamming is a real problem. It has real solutions and it's not a
surprise. (And it's harder to do than the doomsayers would claim, just
as it's more of a problem than some like to admit)

The higher end systems would appear to have highly directional 'phased
array' antena that can exclude the jaming signal by locking onto the
satelite directly based on both satelite signal and known maps of
satelite position. A jammer must thus be as high as possible
(preferably in line with between the satelite ) to get energy into the
sidelobes of the antena.

Low cost solid state acceleromters and inertial guidence systems will
give many munitions a inertial guidence system that will takeover as
soon as effective jamming is detected which is likely to be only near
the target. There are indeed wind corrected bombs that cost perhaps
double that of a GPS bomb but loose only a little in accuracy. On top
of that simple infrared imaging systems based on the same sensors now
used in highend cars add even more accuracy than GPS is capable of.
At best jammer will only be able to degrade the accuracy slightly
while forcing up the price of the munition slighly or even increasing
it by forcing the bomber to add a simple terminal homing system.