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IWR6843ISK: Vital signs demo: best setup to monitor during sleep

Theo Ouali
Prodigy 40 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: MMWAVEICBOOST,

Hello,

My aim is to monitor vital signs during sleep. I thought that the best configuration for the system to work is to mount the IWR6843ISK + MMWAVEICBOOST to the ceiling without inclination, with the torso in the field of view (assuming the person sleeps on the back).

I also changed the Vital signs configuration for the distance,: vitalSignsCfg 1.6 2.2 256 512 4 0.1 0.05 100000 300000

The demo has difficulty finding the person (the range profile varies a lot).

  • Do you think the setup is optimal or is an inclination preferable?
  • In the developer guide you say that the sensor should be mounted upright. Do I have to modify part of the code to be able to use it vertically?
  • Is the fact that a bed is in the scene technically limiting due to interference?

Thank you very much for your support.

Kind regards,

Theo

  • 0
    TI__Guru 69990 points
    Hi Theo,
    Have you checked this configuration with a person standing in front of sensor where there is not background reflection behind the person?
    Cause of the above issue may be due multi-reflection from the bed where the human heartbeat signature is lost.


    Regards,
    Jitendra
  • 0 in reply to Jitendra Gupta
    TI__Mastermind 30405 points

    Hi Theo,

    In addition to Jitendra's suggestion, please try the following things (all with your original setup i.e. person lying on the bed as you've shown)

    1. Try to reduce the distance between the sensor and person. Without a dielectric lens to focus the beam, the SNR at 1.9m may be very low for this particular demo.

    2. The demo selects the strongest peak in the given range zone, for phase measurements. So if the reflection of the bed or surrounding objects is stronger than the reflection from the human/chest, it will be difficult to get the heartbeat measurement. You can check this by looking at the reflection profile without the human lying on the bed. Essentially, you want to make sure that a surrounding reflection, either from the bed or another object in the Field of View, is not masking the reflection from the human.

    Regards

    -Nitin