It’s possible that the radar is measuring the speed of the top of the wheel of the vehicle.
The axle of the wheel travels at the speed of the vehicle. However the top of the wheel travels at twice the speed. So if the wheel is large and exposed (for example in a tractor or 18 wheeler or Mule), there may be enough of a reflection off the top (treads or bolts near the top) that the radar will be able to track those speeds.
All our Doppler radars track multiple targets internally but send out the speed of only one target. The target selected for speed output is based on the user selection of “Select Strongest” or “Select Fastest”. If you are getting fast speeds, please check to see if the current selection is “Select Fastest”. If so, try changing it to “Select Strongest”. The reflection from the wheel will always be weaker than the reflection from the body. Thus selecting to output the speed of the “Strongest” target will usually fix this issue.
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This reply was modified 3 years, 7 months ago by Vipin Malik.