SWRA825 January   2025 IWR6843 , LP87745-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Regulatory Needs for Electro-Sensitive Protective Equipment (ESPE)
    2. 1.2 Different Types of Electro-Sensitive Protective Equipment (ESPE)
  5. 2Advantages of Radar Sensors in Industrial Applications
  6. 3Safety Concept Evaluation/Analysis
    1. 3.1 System Requirements
      1. 3.1.1 Stationary Use Case
      2. 3.1.2 Mobile Use Case
    2. 3.2 Considerations for Sensing Architectures
      1. 3.2.1 System Level Architecture
        1. 3.2.1.1 Bi-Static With Spatial Diversity
        2. 3.2.1.2 Co-Located Bi-Static (Two Sensor Products)
        3. 3.2.1.3 Co-Located Bi-Static (Single Sensor Product, Dual IWR6843)
        4. 3.2.1.4 Mono-Static (Single Sensor Product, Single IWR6843)
        5. 3.2.1.5 Summary
      2. 3.2.2 Latent Fault Monitoring
    3. 3.3 Sensor Level Architecture
      1. 3.3.1 Sensor Level Architecture for CAT 2
      2. 3.3.2 Sensor Level Architecture for Cat 3
  7. 4IEC TS 61496-5 Functional Test Results
  8. 5Other Considerations
    1. 5.1 Vibrations
    2. 5.2 Clock
  9. 6Conclusion
  10. 7References

5.1 Vibrations

One key point to consider which is considered out of scope for this document is the impact of vibration on the detection capabilities. Vibration of the sensor – if left not compensated - will add a Doppler offset to all the targets equivalent to the vibration vector radial component. This could lead to a target appearing static or a static target appearing to move. The safety assessment should address this case specifically.

Possible ways to address this are either:

  • Accelerometer on the PCB to provide an estimation of the vibration
  • Background scene analysis for vibration estimation

Some relevant literature references for those topics are:

  • F. Hau, F. Baumgärtner and M. Vossiek, "Influence of vibrations on the signals of automotive integrated radar sensors," 2017 IEEE MTT-S International Conference on Microwaves for Intelligent Mobility (ICMIM), Nagoya, Japan, 2017, pp. 159-162, doi: 10.1109/ICMIM.2017.7918881
  • (Poole et al., 2022, p. 183) Fig 2. Diagram of the frame-level correction/deconvolution algorithm at the core of the proposed real-time vibration compensation scheme