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14
•
SmartSensor V User Guide
Normal
detection
Signal that doesn’t
return to sensor is
scattered
Signal bouncing off
wall causes false
detection
Figure 5.
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
˿
Sounding walls and more
Fixing occlusion problems
˿
Move the sensor higher on the pole (keeping it within the rec-
ommendations in the mounting guidelines table).
˿
Move the sensor to another spot on the freeway if possible,
away from obstructions.
˿
If there’s a very large barrier in the median, you could do the
following:
̀
Use one sensor on either side of the road, pointing in (be
sure to give the two sensors a 120-ft./36.6-m lateral offset
and put them on different RF channels).
̀
Put two sensors on the same pole in the middle of the
median, both pointing out (put them on different RF chan-
nels), but this would mean they are next to the barrier in the
median and that could cause multipath problems.
Note.
A good rule of
thumb is that 50%
of a vehicle must
be visible above
any barrier in order
to be detected.
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