Re: Radar Jamming

Andy wrote:

> But it occurred to me, why not use the same technique for a radar
> jammer. Whatever frequency hits the receive antenna is amplified and
> modulated with a 2V/lambda doppler OOK signal, and the radar gun
> would register a Volkswagen going at 250 mph, or some such, and
> NOTHING is transmitted until a radar gun signal hits the tag.....
> Seemed like a great idea.
>
> I never tested it on a radar gun, but I am sure the technique is
> worth considering.....

These days, most stationary speed traps in my area use laser guns. About the only place radar is still used is in patrol cars while in motion.

I've wondered about the effectiveness of mounting a set of corner reflectors on a spinning disk (inside a radar-transparent enclosure, of course). You could increase or decrease your reported speed by choosing the direction and speed you spin the disk. This is completely passive, just like your idea, but has the advantage of being low-tech.

I'm not an RF guy but I assume that a fairly small intentional reflector can produce a reflection that is larger than the backscatter from the car body. The spinning will also impart some sort of sinusoidal variation to the reflected signal frequency, but I don't know if this is a good or bad thing. The widget could be mounted on the roof (not so good for cosmetics), or possibly inside the vehicle (much better).

Does this idea have any merit?
.

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