SPRAC03 July   2024 IWR6843

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2TI mmWave Radar and Functional Safety
  6. 3IEC 61496-5 Functional Tests
    1. 3.1 Testing With Static Residual Movement
    2. 3.2 Detection Zone
    3. 3.3 Tolerance Zone
  7. 4Results
    1. 4.1 Response Time
    2. 4.2 Position Accuracy
      1. 4.2.1 Angular Accuracy Error Margins
    3. 4.3 Coexistance of Several RPDs
    4. 4.4 Interference by Object Outside the Detection Zone
    5. 4.5 Interference by Object Inside the Detection Zone
    6. 4.6 Manual Interference
  8. 5Environmental Tests
  9. 6Covered by Other Tests
  10. 7Test Setup Details
    1. 7.1 Detection Algorithm
  11. 8References

4.5 Interference by Object Inside the Detection Zone

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.

Image of Setup for Interference by Object Inside the Detection Zone Figure 4-6 Image of Setup for Interference by Object Inside the Detection 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.

Point Cloud Visualization of Human With Interfering Object Inside the Detection Zone Figure 4-7 Point Cloud Visualization of Human With Interfering Object Inside the Detection Zone

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.