SPRAC03 July 2024 IWR6843
IEC 61496-5:5.4.7.2
It must be ensured that detection capability of targets within the detection zone is not compromised when there is a metallic interfering object closer than the sensor’s minimum distance. In Section 5.4.7.2.1, the standard mentions that the interfering object needs to be in the sensor’s limited position accuracy zone.
With the interfering object at a distance of 5 cm, detection is affected but not compromised at 5 m. The points are more sparse and not as clustered, but the overall detection is strong enough to classify the zone as occupied.
In addition to the limited position accuracy test, immunity against occlusion within the detection zone shall be tested as well under very similar conditions. The difference being the interfering target is a metallic interfering object that covers 50% of the pedestrian test target. This test fundamentally is simpler as the interfering target in the example done covered around 90% of the target.