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AWR1642BOOST: Questions about the demo of vital signs

Gilmmer
Intellectual 330 points
Part Number: AWR1642BOOST

Hi,

I am learning vital signs demo(mmwave_automotive_toolbox_2_4_3__win), and i have encountered some problems that confused me.

1.How to extract phase form selected range bin? Need to calculate the displacement different? Or just calculate the value of phase after Range-FFT.

2.If need to calculate the displacement different, how to calculate?

3.Phase Difference : The phase difference operation is performed on the unwrapped phase by subtracting successive phase values.

This helps in enhancing the heart-beat signal and removing any phase drifts (Referenced from Vital Signs User Guide)

What's the successive phase value ? 

4.Each frame is configured to have 2 chirps. However only the 1st Chirp in the frame is used for processing(Referenced from Vital Signs User Guide)
What's the role of second chirp?

5.New estimate updated every 1 second, does this means you use these 20 frames as a processing unit?

Thank you very much!

  • 0
    TI__Guru*** 148804 points
    1.How to extract phase form selected range bin? Need to calculate the displacement different? Or just calculate the value of phase after Range-FFT.
    [Cesar] Just calculate the value of phase after Range FFT for that particular range bin

    2.If need to calculate the displacement different, how to calculate?
    [Cesar] see answer #1

    3.Phase Difference : The phase difference operation is performed on the unwrapped phase by subtracting successive phase values.
    This helps in enhancing the heart-beat signal and removing any phase drifts (Referenced from Vital Signs User Guide)

    What's the successive phase value ?
    [Cesar] for each range bin, we subtract the phase value at sampling time t(1) from the phase value at previous sampling time t(2)

    4.Each frame is configured to have 2 chirps. However only the 1st Chirp in the frame is used for processing(Referenced from Vital Signs User Guide)
    What's the role of second chirp?
    [Cesar] The second chirp is not used. It could be used to increase the SNR by averaging multiple chirps in the frame. This is not implemented in current release

    5.New estimate updated every 1 second, does this means you use these 20 frames as a processing unit?
    [Cesar] We send to the PC GUI vital sign estimates every frame. There is some median filtering performed on the PC in the GUI that takes the median of previous 20 estimates