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

4.3 Coexistance of Several RPDs

IEC 61496-5:5.4.6.2

Due to the physics of FMCW millimeter wave radar and interference mitigation techniques, it is highly unlikely for other signals to disrupt the RPD’s signal. However, the standard requests a test in Section 5.4.6 of having four RPDs as interfering targets with identical designs to the RPD under test. The CR must go through static residual movement while having no detection ability deterioration. While the test is underway, the interfering RPDs needs to be power cycled at least 10 times, over the course of two hours. This is to switch up the timings of the chirps.

Image of Setup Used for Coexistance of Several RPDs Functional Test Figure 4-3 Image of Setup Used for Coexistance of Several RPDs Functional Test

The resulting point cloud was identical to what it would look like if there were no interfering RPDs at all. This is due to the configured static clutter removal algorithm removing any detections with 0 Doppler. Static clutter removal is not required, but it helps to visualize only moving targets. In addition the detection zone never changed to unoccupied while the target was inside the detection zone.

More details on interference involving multiple RPDs can be found in the document Interference Mitigation For AWR/IWR Devices.