🚀 go-pugleaf

np4@prism.gatech.EDU (Nick Pomponio) writes:

>The ECM device can be a simple repeater applying amplitude modulation to
>the received signal. The AM frequency would be a function of the actual
>velocity, the desired (deception) velocity, and radar signal wavelength.
>Simple AM will produce two false velocity "targets"; the undesired one
>could be supprssed by using a single sideband AM scheme.

>-- 
>POMPONIO,NICHOLAS A

Okay, in theory I'll buy this, but lets see how it would work in
practice.  You'd need to detect (very quickly) the signal, have some
kind of a system wired up that would determine how much frequency
(i.e. apparent doppler) shift to apply, and retransmit that signal
(presumably with something that radiates independently of phi, like
a dipole).  Further, you would need to make sure that you would not
detect the signal that you would be transmitting, which is only
a few hundred Hz (if memory serves we're talking about 30 Hz/mph,
but I could be wrong) off the one you received, or your repeater would
lock up.  And keep in mind that you'll be transmitting significantly
more power than that which is received.

Yeah, I'll believe that it can be done.  It would even provide some
interesting engineering challenges, but this strikes me as the kind
of problem people solve for the fun of solving it, not because they
really need ECM for their CAR (an F-16, yeah, but not my Plymouth).
Also, to design this properly, you would need some pretty expensive gear.

Just a thought.  I'd sure like to see the results somebody else comes
up with, but for me this reminds me of hacking computers -- an interesting
problem that I don't want to spend too much time on.


Sure is an interesting discussion, though.

Joe Carey
joe@lobos.colorado.edu