Installation and Manual Documentation
Document date:
CC-DA/ESR1
CR5CPCCF
18 Feb 2020
Page:
20
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Vertical tilt angle for low level functions (e.g. BSD, LCA A, DOW,...)
Vertical tilt
reflection
coefficient
max. tolerance
thickness
tolerance
ε
r
tanδ
application
±0.2 mm
±0.02
<0.03
unpainted,
(black)
painting,
embleme
±0.1 mm
±0.2
<0.03
painted
bumper
>8°
>-6 dB
±0.2 mm
±0.2
<0.05
painted
bumper
>-10 dB < -6 dB
Table: minimum vertical tilt angle of fascia to sensor normal for low level functions (e.g. BSD, LCA
A, DOW,...)
Curvature of fascia for CR5CP
Curvature of the fascia may influence the radar performance, especially with low vertical tilt
angles. The minimum radius of the curvature shall be according to the following rules:
R > 350 mm, no significant influence expected
R < 350 mm, significant influence possible, has to be evaluated
R < 200 mm, significant influence expected, not recommended
Absorber around the sensor
It is highly recommended to use a cone made of absorber material around the radar cone of the
sensor to prevent ghost targets. The design of the absorber cone must fulfill the following design
guidelines (reflection from outside the radar cone, multipath reflection).
Reflection from outside the radar cone
Reflections from structures located outside the radar cone have to be avoided.
Furthermore interference signals picked up by the sensor antennas should be avoided by keeping
a minimum distance (d) of 5 mm to 10 mm for parts in front of the sensor.
Even with compliance to the radar cone, reflections at parts outside the radar cone may disturb
the received signal. Reflections at parts causing an interference signal to the receiving antenna
and reflections at parts getting to the receiving antenna after a second reflection at the fascia
(multipath reflection).
Closed surfaces of brackets and masks made of metal or high reflecting material need a tilt angle
being arranged that the reflection is not received by the receiving antennas of the sensor.
