Chapter 1: Choosing a mounting location
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9
Figure 3. Occlusion
Occlusion occurs when one object blocks another object from the
sensor’s view, as shown above. This can happen with
˿
Tall vehicles like semi trucks
˿
Signs
˿
Barriers and sounding walls
˿
Trees and more
Normal
detection
Signal that doesn’t
return to sensor is
scattered
Signal bouncing
o wall causes
false detection
Figure 4. Left: direct path return; right: multipath return
Multipathing occurs when a large flat surface near the sensor inter-
feres with detection. A radar signal can bounce around several
times between the surface and the vehicles before returning to the
sensor. This can make the sensor detect a vehicle where there is
none.
This can happen with
˿
Buildings
˿
Signs
˿
Guard rails
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