Brute force laser jammers

chakeubeam

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THX1138

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Even at 940nm, you should still get some output around 904nm. It would be an interesting experiment to see if lidar acquisition range could be reduced. I'm doubtful that it would help with a short range shot.
 

PointerCone

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OK, help me out here. This spotlight from Rigid produces at the invisible spectrum. Are you still able to see what it illuminates with the naked eye or are there glasses that you need as well?? This would be great for boating at night since you're technically not allowed to use visible spotlights in the presence of other vessels.
 
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poop

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OK, help me out here. This spotlight from Rigid produces at the invisible spectrum. Are you still able to see what it illuminates with the naked eye or are there glasses that you need as well?? This would be great for boating at night since you're technically not allowed to use visible spotlights in the presence of other vessels.
It sounds like it's used to illuminate an area in IR allowing people with IR goggles to get a better visual on things. Like how the old IR military stuff still required an IR light source.
 

PointerCone

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It sounds like it's used to illuminate an area in IR allowing people with IR goggles to get a better visual on things. Like how the old IR military stuff still required an IR light source.
So without a scope or binoculars, you arent seeing anything..............

Ive been looking at Gen 2 for monocular but they are pricey!!
 

poop

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So without a scope or binoculars, you arent seeing anything..............

Ive been looking at Gen 2 for monocular but they are pricey!!

Go get one of these relics instead: an active IR scope (battery pack not in picture) That big round thing on the top was the IR source for the shooter. :) Of course if the enemy had similar gear, he could spot this quite easily...


active.IR.scope.XM21 w-Pan4 L.jpg
 
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kyle13

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They might provide some lag in acquiring your speed but they probably wont jam, the gun would just filter out the pulses sent back and get your speed.
 

NucRdr

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The jammer shouldn't transmit at anything other than 940nm, as laser light is created through a diode specially designed to resonate and transmit at a specific frequency, and most current LIDAR guns should be able to distinguish their own signals, or to at least throw a jam code because of being overloaded. You could still see the IR light through a camera. Vortex has a great video on how brute force jammers work: https://www.youtube.com/watch?v=RYuqstFQ3BI but I think a big difference is that lidar brute force jammers send continuous pulses and not a continuous beam of light, which means that most of its effectiveness would be outside of modern LIDAR guns' windows for speed acquisition. As a result, it would most likely be useless against most modern guns. However, with all of that said, it's mainly theoretical and it would be pretty interesting to test and see results!
 

bslaws

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The jammer shouldn't transmit at anything other than 940nm, as laser light is created through a diode specially designed to resonate and transmit at a specific frequency, and most current LIDAR guns should be able to distinguish their own signals, or to at least throw a jam code because of being overloaded. You could still see the IR light through a camera. Vortex has a great video on how brute force jammers work: https://www.youtube.com/watch?v=RYuqstFQ3BI but I think a big difference is that lidar brute force jammers send continuous pulses and not a continuous beam of light, which means that most of its effectiveness would be outside of modern LIDAR guns' windows for speed acquisition. As a result, it would most likely be useless against most modern guns. However, with all of that said, it's mainly theoretical and it would be pretty interesting to test and see results!
Did you mean 904nm? So my main question is if the lidar gun is being blinded or overpowered by a non pulsed or reflected source ( I realize they will see an error or jam) and couldn't see their own reflected signal, wouldn't this give additional time to reduce speed? I guess this would interfere with normal parking sensor operation as they too would see this. My though is you aren't running parking senors, just some fancy driving lights. What's the harm in that? They certainly aren't illegal. I would compare this to the errors we receive on ALPs when driving directly in to rising or setting sun.
 
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pipinos1976

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The answer is yes. If the LIDAR gun is overpowered it can't distinguish it's own pulses through the light barrage. This could give you enough time to slow down if you had a receiver that 100% of the time gives you correct warnings.

BUT, and here is the tricky part, this could work only to a certain scenario where the Tx is far away from the target. It's much like the old Radar Jammers that provided protection to aircrafts up until the breakthrough (BT) point where the reflection of the target has more power than the noise transmitted by the plane to cover it's track. I can analyze it a little more. When you send a signal from the gun (pulses to be exact) this signal has to do the following trip: gun-target-gun. Thus, the signal is reduced by the power of 4. The signal that the target (car, aircraft etc) transmits has to travel only the distance from the traget to the gun. Thus, it's reduced by the power of 2. As we get closer to the transmitter (gun) the reflection from the target (car) is getting bigger and bigger faster than the power produced by our jammer (in this case the light source). There is a certain point where the reflection has more power* than the light we transmit and the gun will get the speed.

Now, lets be more practical. It's impossible to give certain numbers since the reflection of the target and the transmitted power is a variable factor (different cars and guns). So, in Europe (I can talk about Greece at least) where they try to acquire speed at the far edge of the gun's capabilities such a solution could work. In USA where LEOs clock speed under 1000ft (about 300m) I highly doubt that's possible to use such a countermeasure.

* It doesn't have to be a high powered gun. It only needs high peak power and fast pulse train to give higher mean power than the light source we use. Of course, if someone could make both high power and high pulse rate light source the guns would be defeated easily. By the current technology though it's impossible to make such a countermeasure since the power needed and the cooling part are way too big to use them in a small vehicle (car).
 
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