Testing Testing ADAS Functions in Parallel with EMS Measurement In vehicle final inspection, safety-relevant functions of the driver-assistance system can be tested in parallel with infotainment-system EMS measurements. This allows manufacturers to make the most of available time in the EMC test chamber. by Sam Chew and Jacky Li Many advanced driver assistance systems (ADAS) use radar sensors for functions such adaptive cruise control (ACC) or autonomous emergency braking (AEB). These sensors are safety-relevant components and therefore must work reliably even in extremely demanding RF environments. This is checked in full-vehicle tests using stringent electromagnetic susceptibility (EMS) tests in line with ISO 11451-2. But can ADAS functional tests be performed under adverse electromagnetic compatibility (EMC) conditions? ADAS tests in an electromagneticdisturbance environment In the test process, the ADAS test system runs through various simulated realistic test scenarios that activate the ADAS functions in the vehicle under test (VUT) and should trigger the intended response. The main challenge is that this must work reliably even under electromagnetic conditions when EMS measurements are being made at the same time in the EMC test chamber, for example on the vehicle radio. Otherwise, the ADAS functions cannot be evaluated in this environment. The ADAS test system consists of a radar echo generator, a dynamic target positioning system and the EMS test system. The vehicle usually has a longrange radar sensor for automatic distance control and several near-range radar sensors for collision avoidance systems. On one hand, the tests check whether the sensors have been properly integrated in the bumpers so that the antennas can illuminate the intended sectors. On the other hand, in conjunction with the dynamic Testing time in the EMC test chamber can be maximized by performing ADAS functional tests in parallel with EMS measurements of the infotainment system. ADAS & AUTONOMOUS VEHICLE ENGINEERING July 2023 15 Rohde & Schwarz