Re: Radar Jamming


A.Nonny Mouse wrote:
> 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?

Andy writes:

That sounds like a neat thing to try. I would mount three mirrors as

a corner reflector, which essentially BEAM the laser signal back to the

source --- very directional , and a very high reflection coefficient.
Then, if the assembly was mounted on a bigass speaker assembly, which
was modulated with an audio tone ( 2V/lamba again) it should do the
same
as the backscatter tag I have mentioned before, only at light
frequencies.
I would really like to try this --- the three mirror technique is
used
for enhanced reflectors for sailboats - to give a bigger radar return-
only
they are made of metal to be useful to radar signals....

I think you are onto a good idea, but a three corner reflector will
give
a much better RCS return since this arrangement is like a beam
reflector.
You gotta try it out with a laser lever or pointer to see how well it
works, but the return is very high......

If you, or anyone else, would like to BS about this, I would be
please to correspond.

Andy at andysharpe@xxxxxxxx

.

Relevant Pages

  • Apollo 11 Experiment Still Going Strong after 35 Years
    ... up to attend Woodstock?and America landed on the Moon, ... Called the lunar laser ranging experiment, ... other scientific experiments left on the Moon, this reflector requires ...
    (sci.astro)
  • Apollo 11 Experiment Still Going Strong after 35 Years
    ... up to attend Woodstock?and America landed on the Moon, ... Called the lunar laser ranging experiment, ... other scientific experiments left on the Moon, this reflector requires ...
    (sci.space.history)
  • Re: for BMJ and all other parochial lot re moon landing
    ... reflective nature of the suits, equipment, etc. ... Yeah, but to play devil's advocate, if they didn't go on the trip, then they wouldn't get cancer, either. ... I say --as I did before-- that the prism laser reflector array that they left at a particular crater location could almost be in the range of affordability for an individual to build the equipment and find strong echos from that location vs weak echos from everywhere else on the face of the moon orriented towards us. ...
    (sci.research.careers)
  • Re: Bad News for Moon Hoax Buffs
    ... The laser reflector has a image and you see it is flat against the ... But the earth is 30 deg off the moon!! ... The laser can ot come back over it's own path. ...
    (sci.physics)
  • Re: Simple question about a laser pushing a proton.
    ... The end of the laser beam itself, ... You have a magnetic ring, ... The laser beam only needs to be as long as the radius. ... Sorry, I was confused by "They don't hit the reflector, (there is no ...
    (sci.physics)