• State Resolved
  • Locked Locked
  • Replies 8 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 317 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AWR6843AOP: Max Range of Vital Sign cannot meet the claimed 7.2 meter

Wayne Tsao
Prodigy 50 points
Part Number: AWR6843AOP

Hello TI,

We would appreciate if you could answer why we cannot detect person who is over 6 meters away from the AWR6843AOP while according to Vital Signs With People Tracking User Guide, the Max Range is 7.2 meter.

For better observation, I changed the Boundary box from 6 meter to 8 meter. Please refer to attached chirp config file original 6m and new 8 m. 

Observe in TI's mmWave Industrial Visualizer, when person(me) stands at 5 meters away from AWR6843AOP the status show "Presence". However when I walk 1 more meter away to 6 meter, the vital sign stops and status show "No Patient Detected" 

  • 0
    TI__Genius 12380 points

    Hello,

    Allow me to confirm this information and get back to you. 

    Thanks,

    E. Shareef

  • 0
    TI__Genius 13215 points

    Hi,

    For this demo, the person who's being tracked should be within 5m of the sensor. Earlier in the guide we mention:

    "The vital sign measurements will only be accurate when the tracked person stops moving for at least 20 seconds. The person should be seated or lying down with the sensor pointed toward their chest, up to a 5m distance."

    Thanks,

    Clinton

  • 0 in reply to Clinton Rodgers
    Prodigy 50 points

    Hello Clinton,

    Many thanks for your answer. I have three further questions regarding to the "5m" as below.

    1. The Maximum Unambiguous Range is 7.2 m but the person should stand at "5 m" for 20 seconds to get stable vital sign data, what is causing the 2.2 m tolerance?

    2. We understand that the 7.2 m maximum unambiguous range is calculated from the formula in Detection Layer Tuning Guide table 3. But where does the "5m" come from? Is it by calculation or testing?

    3. Is that possible to extend from "5m" to 10m or 15m? According to Detection Layer Tuning Guide page 51 by adjusting parameter <freqSlope><numAdcSamples><digOutSampleRate><txOutPowerBackoff> the "range" can be configured, but it is for Maximum Unambiguous Range. 

  • 0 in reply to Wayne Tsao
    TI__Genius 13215 points

    Hi,

    Thanks for the follow up. We will reply in the next day or so.

    -Clinton

  • 0 in reply to Clinton Rodgers
    TI__Expert 8920 points

    Hi,

    Maximum unambiguous range is determines the range till you can track a person but the Vitals signs determination accuracy drops significantly beyond 6m

    Vital signs are measured based on the chest  movements of the person who is being tracked. So, this demo does not work beyond 6m although the chirp configuration provide 7.2m range

    Changing the chirp configuration with slope, no of adc samples will change the maximum unambiguous range but you will run into the same issue of vitals signs not being very accurate beyond 6m

    Regards

  • 0 in reply to Abhishek Karkisaval
    Prodigy 50 points

    Hello Abhishek,

    Many thanks for your guidance. According to your reply I made 2 conclusions:

    • Conclusion 1: The maximum unambiguous range of "People Counting" is 7.2m. This range can be extended by changing chirp config such as slope, number of adc samples, Tx output power,....
    • Conclusion 2: The maximum range of "Vital Sign" is 6m, this cannot be extend by changing chirp config

    However I still don't understand why the vital sign is only accurate within 6 meters. Is there anything I can do to extend the 6m to 7m, or 8m?

  • +1 in reply to Wayne Tsao
    TI__Expert 8920 points

    Hi

    Beyond 6m, accuracy of vital signs detection decreases, currently we do not have a mechanism to increase the accuracy at longer distances.

    You may have to consider a different way of determining the phase changes of the chest cavity movements to determine vitals

    Regards

  • 0 in reply to Abhishek Karkisaval
    Prodigy 50 points

    Thanks for your guidance.

    Now I understand for current algorithm the Vital Sign can only be accurate within 6 meters and currently no solution to extend that, because the phase change of chest cavity movements which are over 6 meters cannot be detected.