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Old 19-12-2012, 05:50 PM
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Originally Posted by row011 View Post
With your former job being a police officer? - you would of been told or by your own research discovered how the cosine error can benefit the driver, not the operator. The further the distance from the angle of 0 to the moving target, the less accurate the true speed reading becomes as it displays a speed less than the actual speed of the moving target.

While LIDAR guns lock on to a certain point to obtain a single speed reading after multiple calculations they are effect by the cosine error, the Poliscan operates significantly differently to a conventional lidar gun in the sense it scans from side to side in a sweeping motion the amount of times per second this occurs varies depending on traffic density. The Poliscan does not lock onto a certain area of the car, but rather calculates the speed of a moving target multiple times based off positioning and vehicle width using intelligent software algorithms design by the manufacture. As a result, the Poliscan is not effect by the Cosine error.
Thanks, that actually clears it up... just wasn't a full bottle on how the Poliscan worked; we don't see these things down in my neck of the woods, & I get the picture now...

And, you are right that cosine error does generally benefit the driver, except in the situation I mentioned above, whereby returning from the right into left lane at the same time of crossing the radar/laser beam does actually inflate the driver's speed... the converse is also true, that going from left to right lane while crossing the beam reduces the reading. The Poliscan's detection method is obviously a newer technology with its "sweeping" beam and multiple calculations.

Thanks for your input, much appreciated .
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