ADAS & Autonomous Vehicle Engineering - July 2023 - 17
Testing
Figure 3: In this example test setup, the components shaded dark gray are part of the EMS test system. The radar echo generator
and target positioning system also are controlled by the EMC test software.
but only up to the speed set in the ACC and no higher.
To test the emergency braking function, the VUT
drives at constant speed until a simulated vehicle driving
in front of it suddenly brakes. Two test scenarios are
used for this: one with a simulated vehicle constantly
driving in front of the VUT and another with a simulated
vehicle that suddenly changes lanes and brakes in
front of the VUT. For this, the front radar sensor and
the echo generator on the positioning system must be
precisely aligned with one another. If the sensor behind
its cover is not externally visible, its exact position can
be determined with the aid of a laser pointer.
In total, ten different test scenarios for ACC and
four scenarios for AEB are performed on the vehicle
test stand with induced disturbance signals, with the
field strength rising to 30 V/m.
Optimizing test-chamber time
To use the time in the EMC test chamber as efficiently
as possible, the ADAS functions can be tested in parallel
with EMS measurements of the infotainment system. It
is important that the radar sensor has an unrestricted
field of view to the radar echo generator during the
measurements and both are precisely aligned.
Standard-compliant EMS measurements on
radar sensors in line with ISO 11451-2 take place in
the frequency range from 10 kHz to 18 GHz and typically
achieve field strengths up to 200 V/m. With a
suitably designed EMS test system, these tests can also
be performed by the test engineer on the test bench. ■
This article was written by Rohde & Schwarz's Sam Chew, Technical
Sales for EMC Projects, and Jacky Li, Senior Systems Engineer.
MSS/MSD/LPS/LPR Power Inductors
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* Wide range of inductance values from
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Free Samples @ coilcraft.com
ADAS & AUTONOMOUS VEHICLE ENGINEERING
July 2023 17
Rohde & Schwarz
http://info.hotims.com/84489-704
ADAS & Autonomous Vehicle Engineering - July 2023
Table of Contents for the Digital Edition of ADAS & Autonomous Vehicle Engineering - July 2023
ADAS & Autonomous Vehicle Engineering - July 2023 - CVR1
ADAS & Autonomous Vehicle Engineering - July 2023 - CVR2
ADAS & Autonomous Vehicle Engineering - July 2023 - 1
ADAS & Autonomous Vehicle Engineering - July 2023 - 2
ADAS & Autonomous Vehicle Engineering - July 2023 - 3
ADAS & Autonomous Vehicle Engineering - July 2023 - 4
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ADAS & Autonomous Vehicle Engineering - July 2023 - CVR3
ADAS & Autonomous Vehicle Engineering - July 2023 - CVR4
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