<VV> Radar & Front Plates

[jvhroberts at aol.com]

 Negative. High beams don't affect lidar whatsoever. And that test proved that. The reflectivity of the car has some effect, white being measurable at a greater range than black, lots of chrome is the enemy as well. The lidar is pulsed at about 3000 Hz, and that is easy to discriminate against infrared background radiation. Heck, solar radiation has a lot more IR in it than high beams do!

In the end, here are the basics:

Radar is easy to detect, but hard to jam. 
Lidar is hard to detect, but easy to jam. 

Lidar is in use, but its use has been cut back over the last several years due to some high profile court cases proving these units aren't as good as advertised. 

The major difference in operating mode is radar uses Doppler, meaning the frequency shift of the reflected signal is proportional to speed. Lidar measures the range to the target, and determines the rate at which it is changing. Moving the lidar gun has been proven to introduce significant errors. Panning up or down the side of the vehicle also can introduce errors. Lidar, I predict, has a limited life due to its inherent limitations and the provable collusion between the manufacturers, the police agencies, and the insurance companies. 

 

John Roberts
 

 

-----Original Message-----
From: Joel Rushworth <gwydionjhr at shaw.ca>
To: virtualvairs <virtualvairs at corvair.org>
Sent: Sun, Dec 9, 2012 10:00 am
Subject: Re: <VV> Radar & Front Plates


I also forgot to mention.

I remember seeing a test years ago in Car & Driver.  Having your high beams
on will interfere with a Lidar gun as they are based in the Infrared
spectrum.  The tests used a 4th gen Camaro, with and without license plate
and without license plate and with high beams on.  Each modification had a
significant impact at which the Lidar gun would get a reading at.

Regards,
Joel

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Joel Rushworth
Sent: Saturday, December 8, 2012 5:42 PM
To: virtualvairs at corvair.org
Subject: Re: <VV> Radar & Front Plates

While it will have little to no effect on a radar gun, the front licence
plate is the target of choice for police when using a Lidar gun.

With it's prominent downward angle on the front of the LM 'vair, I've often
wondered how difficult it would be to get a positive reflection off of it
with a Lidar gun.

Regards,
Joel

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Frank DuVal
Sent: Saturday, December 8, 2012 3:53 PM
To: virtualvairs at corvair.org
Subject: <VV> Radar & Front Plates

What difference does a 12" x 8" or so aluminum plate on front of a mass of
steel about 24" x 55" have on radar reflections?

Extremely minute!

Frank DuVal


On 12/8/2012 6:00 PM, Charlie wrote:
>
> I think the reason I never got a ticket before is that I usually have 
> no front plate for radar to reflect back, and I was driving a rental 
> with a front plate?
>
> Next time, I take the front plates off when cruising the insterstate 
> 'revenue roads' !
>
> Charlie
>

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