
Originally Posted by
Mikkel
Laser guns are range finders operating in the micro-wave part of the electromagnetic spectrum. They measure the distance to an object about once every millisecond, calculate the difference and then return the speed. This is why it is possible to design a laser jammer - 1 ms is plenty of time for good electronics to establish the incoming frequency and start emitting a very noisy background which drowns out the laser's own signal.
Er, almost. To be precise ;
/pedant Laser guns use an optical laser operating in the micrometer (light) part of the electromagnetic spectrum. It's not radio waves, or microwave radiation. I would be very surprised if LIDAR jammers actually measured the incoming energies' frequency and took active steps against it. I think you will find they simply broadcast a bright modulated light "blinder" on or about the same light wavelength, effectively burying the microscopic laser reflection in a sea of fog.

Originally Posted by
Mikkel
Radars on the other hand operate based on the doppler shift for a reflected beam. There's no viable way to jam a doppler radar.
Correct, but they can be jammed once you know the transmitting frequency, thusly ;
The stalkers' digital displays can only indicate two speeds - the primary target speed, and the maximum speed. These two "speeds" are two doppler reflections (radio frequency signals), so we need to simulate these, or at least mask the one the radar unit should be displaying. The easy way seems to be to (over)modulate a microwave source with a square wave signal of about 1KHz. This should fill the bandspace with multiple targets spaced 1KHz apart, making far more targets than the operator is capable of legally* resolving. Note that it will not conceal your high speed (the stalker will quite likely still pick you out as the highest speed target) but his audio will so absurdly cluttered that either the operator or the stalker will be well into "WTF" mode. I do not think the operator will trust his machine with this much crap coming out of the speaker.
*The judge will raise an eyebrow at the officers' description of the horribly cluttered tone. While the instrument might be content, the judge will not. In case the officer bare-faced lies to the judge and says he had "clean tone" on you, all you do is ask how that could be, since you were jamming him with a wideband squarewave signal, and indicate to the judge that his summary description of the observed tone is infeasible considering the conditions, and watch him suddenly "remember".
Fun fun fun!
edit: disclaimer: I don't advocate speeding everywhere. It's dangerous. Your family (especially your mum and your lovely daughter) will cry when you are dead. Don't do it.
Steve
"I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
"read what Steve says. He's right."
"What Steve said pretty much summed it up."
"I did axactly as you said and it worked...!!"
"Wow, Great advise there DB."
WTB: Hyosung bikes or going or not.
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