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AWR1642: Occupancy and Vital Signs Detection - Phase Value

Christoph Domnik
Prodigy 20 points
Part Number: AWR1642

Hi,

I recently have discovered the Automotive Toolbox to measure vital signs with the AWR1642. With the Occupancy and Vital Signs Detection lab I got good results, but for further work I needed to get the phase values from the signal of one target. In the data send from the AWR1642 is a parameter called phase but I could not figure out how this value is generatet for each frame.

Is it the mean value of the signal phase from all frequency ramps? What ist this phase value? Unfortunaly I could not find anything about this in the documentation of the lab.

My Setup: AWR1642BOOST (version 2) with Occupancy and Vital Signs Detection lab running in Matlab

Hope anyone could help me with this.

Regards, Christoph

  • 0
    TI__Guru*** 149204 points

    Hi,

    We have to review your question with the algorithm team.

    It will take a few days to get back to you

    thank you

    Cesar

  • 0 in reply to Cesar
    TI__Guru*** 149204 points

    Hi,

    The 16xx Vital Signs lab does not use a matlab gui.

    Which version of the Automotive Toolbox are you looking at?

    I recommend you look at the following version. (There is a known bug in the version 3.2)

    mmwave_automotive_toolbox_2_9_1__win\mmwave_automotive_toolbox_2_9_1

    The phase value sent out through the UART is explained in slide 5 in the Developers Guide. Basically the unwrapped phase from the target range-bin is calculated and sent through the UART. The theory is mentioned in slide# 4  and the block diagram is in sldie#6,7.

    In the C code, the phase is computed by the atan2() function  where the argument is the real and imaginary part of the target range bin. Note that this phase value is unwrapped (using the function unwrap()) before sending through the UART

    Thank you

    Cesar

  • 0 in reply to Cesar
    Prodigy 20 points

    Hi,

    i was looking at the Version 3.1 of the Automotive Toolbox. But i did not use the Vital Signs Lab. Instead I used the Occupancy and Vital Signs Lab (mmwave_automotive_toolbox_3_1_0\labs\incabinsensing\occupancy_plus_vital_signs).

    I think the older Version of the Driver Vital Signs lab could work for me. I will try it out and answer later if it worked for me.

    Thank you for your help :)

    Christoph

  • 0 in reply to Christoph Domnik
    TI__Guru*** 149204 points

    Thank you

    Cesar