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IWR1443: Clarification on mmWave sensor radius limitation

Martin Therrien
Prodigy 10 points
Part Number: IWR1443

Tool/software:

Hello

I would like clarification from a documented limitation of mmWave sensor

According to the reference document https://dev.ti.com/tirex/explore/content/mmwave_industrial_toolbox_4_2_0/labs/vital_signs/14xx_vital_signs/docs/vitalSignsLab_xwr1443_DevelopersGuide.pdf in page 37, "Any objects within the same radial distance, plus ~1m, as the subject can impact the measurements"

Are we to understand that there should be:

A- "no objects around the SUBJECT within a radius of 1m+sensor to subject distance"? 

B- "no objects around the SENSOR within a radius of 1m+sensor to subject distance"?

C- or something else entirely?

Also, can I have details on the expected impact of having object within the radius without being between the subject and sensor?

and do object types(electronics, plastic, metal, .., of course other individuals) matter, what is considered OK ( a blank wall, chairs, tables, curtains...)?

Thanks

  • +1
    TI__Genius 11750 points

    Hi,

    As the vital signs measurement is based on tracking a person and the track data is used as input for vitals calculation. If there is any moving object close to the tracked person, it affects the vitals measurement. However, there is no affect from a stationary object.

    No moving object within +/-1m of the tracked person would be the correct interpretation

    There is no influence due to object types. Objects are detected based on their reflectivity and radar cross section surface area. A metal will reflect better compared to cloth or plastic. Do note that curtains when its moving could be detected as an object due to its motion but if it is static, it has no effect

    Regards

  • 0 in reply to Abhishek Karkisaval
    Prodigy 10 points

    Thanks for the reply! So, to make sure it's clear, considering the reflectivity of objects, the rule should be "no moving objects NOR stationnary metallic objects within +/-1m (approximately 1m) of the tracked individual" ? 

    so the previous sentence  "Any objects within the same radial distance, plus ~1m, as the subject can impact the measurements",  the "plus ~1m" is not read "plus approximately 1 meter"(added to a sensor-subject distance) but just "approximately 1 meter" ? 

  • 0 in reply to Martin Therrien
    TI__Mastermind 20961 points

    Hello, 

    Abhishek is currently out of the office. He will be able to comment tomorrow when he is back. 

    Best Regards,

    Josh

  • +1 in reply to Josh Dye
    TI__Genius 11750 points

    Hi,

    Yes, It would be correct to say objects, 1m around the tracked objects will influence the vitals measurement

    Regards