If I mount speed radar on a moving vehicle will it read correct speeds?

[Vipin Malik]

#362

If you need to mount the radar in a speed sign on the back of a truck (say Truck Mounted Attenuator or TMA), you must use ground speed correction to display the correct speed.

[Vipin Malik]

#363

All speed measurement devices measure relative velocity between the measurement device and the target. This means that if the radar is moving (e.g. mounted on a moving vehicle) it will measure the (vector or signed) speed difference between itself and the target.

Thus, if the radar is mounted rear facing on a vehicle and vehicle is moving on the road at (say) 30 mph, and another vehicle is approaching from behind at (say) 60 mph the radar will read (60-30) or 30 mph.

If you want to read the correct speed of the approaching vehicle, our SS400 radar features “ground speed correction”. When enabled (via the user configuration GUI), the radar will track its own speed by tracking the outgoing ground speed and will correct the speed of the incoming vehicle by its own speed and read the correct target speed of 60 mph.

This allows you to mount the SS400 in a “You Speed Is” speed sign on the back of a truck and track and show correct speeds of fast vehicles approaching from behind. The SS400 radar is also available in our PNL10 two digit display which makes for an easy to use kit to make your own “Your Speed Is” sign.

• This reply was modified 3 years, 1 month ago by George Meszaros.

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