Figure 7: Reflection at bracket or mask
For closed surfaces (masks) in azimuth, the angle between mask surface and the normal
vector n of the sensor shall be greater than the azimuth opening angle of the keep-out zone.
For closed surfaces (masks) in elevation, the angle between mask surface and the normal
vector n of the sensor shall be greater than the azimuth opening angle of the keep-out zone.
Multipath reflection
Reflections of incoming signals at bracket or shielding absorber are coming back to the sensor
if reflection at the bumper occurs. The figure below shows the situation which should be
avoided. The worst case happens if the combination of the vertical tilt angles of shielding and
bumper is
1
=
2
/ 2 . For a low interference signal the condition shall be:
1
>
2
/ 2 +10°
or
1
<
2
/ 2 -10°
Figure 8: a) Requirements for parts outside radar cone to avoid multipath reflection
The same requirements are valid for a horizontal tilt of the fascia.
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