Wavetronix Expanse XP20 User Manual page 10

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
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
˿
Figure 3. Occlusion
Signal bouncing
off wall causes
false detection
Chapter 1: Choosing a mounting location
9
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