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Old 04-05-2008, 02:06 PM   #1 (permalink)
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Default Lidar Cosine Effect

Here is a copy of the lidar cosine effect from law enforcement training manual. It will show the true speed data with different angles.

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Old 04-05-2008, 02:23 PM   #2 (permalink)
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You can easily calculate the speed using the formula below to create such a chart in excel

true_speed = radar_speed / Cos(angle)

Edit: Corrected typo caught by memtek
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Old 04-05-2008, 02:37 PM   #3 (permalink)
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Default

I've rescanned the document and is better.
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Not great results all the time, it's very dependent on how they set them up and how much traffic is around to give reflections
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Old 04-05-2008, 03:33 PM   #4 (permalink)
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Default

Quote:
Originally Posted by ahmadr
You can easily calculate the speed using the formula below to create such a chart in excel

true_speed = radar_speed * Cos(angle)
Nope, I'm sure it was a typo on your behalf. Correct is:

radar_speed = true_speed * Cos(angle)

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Old 04-05-2008, 04:56 PM   #5 (permalink)
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Oops
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Old 04-05-2008, 06:04 PM   #6 (permalink)
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It appears to be better than radar?
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Old 04-06-2008, 11:05 PM   #7 (permalink)
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how so u read this and what is the term mean?
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Old 04-06-2008, 11:17 PM   #8 (permalink)
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It basically means that unless a LEO is standing directly in front of a speeding car (0 degrees), the speed the gun will show will be less than what the car is actually doing.

For example, if the car is doing 70, and the LEO were standing 60 degrees off the side of the road, the gun will read 35 MPH. If he were standing 20 degrees, the gun will read 65.
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Old 04-06-2008, 11:43 PM   #9 (permalink)
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Quote:
Originally Posted by ELVATO
If he were standing 20 degrees, the gun will read 56.
I'm pretty sure this is just a typo error.
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Old 04-06-2008, 11:53 PM   #10 (permalink)
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Quote:
Originally Posted by Azonehits
Quote:
Originally Posted by ELVATO
If he were standing 20 degrees, the gun will read 56.
I'm pretty sure this is just a typo error.

I don't know what you're talking about.

ops: We can only wish it read that, huh.
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