DragonEye SPEED LIDAR Manuale dell'operatore - Pagina 10

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Canadian DragonEye Speed LIDAR

Operator Manual

Appendix A – Cosine Effect

The term "Cosine Effect" as typically used in law enforcement speed

measurement refers to the reduction of a vehicle's measured speed

using Radar or Laser systems as compared to the actual vehicle

speed, when targeting the vehicle at an angle. The diagram below

shows the line "V" as the vehicle's travel direction and the LIDAR

operator's line of sight "O" to the target vehicle. The angle between

these two lines is labeled theta "Θ" . Motion of the vehicle along

"Line V" is projected onto the LIDAR operator's line of sight "Line O".

Using standard trigonometry, this projected motion can be shown to

be:

ΔO = ΔV x COSΘ

Line V

ΔV

ΔO

Line O

DragonEye Technology, LLC | Doc. 30508 Rev 05