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Original question:

IWR6843: People Counting

IWR6843: People Counting

Anthony Pesin
Intellectual 600 points
Part Number: IWR6843

Dear Technical Support,

I would like you to confirm my understanding about the metrics available:

1 - Point Clouds are identified with these metrics: distance, velocity (not only radial velocity through doppler frequency but full vector of velocity), snr, angle of arrival

2 - Targets are identified with these metrics: position, radial velocity (so doppler here), acceleration, all 3 for 2D or 3D coordinates depending in the tracker used. There is also covariance matrix and gating function gain which relate more to the centroid characteristics if I understand correctly?

I also understand that user needs to check the TLV type to extract either Point Clouds characteristics or Targets characteristics, is that correct?

Thanks for your support.

Best regards.

Anthony.

  • 0
    TI__Mastermind 28055 points

    Hi Anthony,

    1.  You are right except for the velocity. Point cloud returns distance, angle, snr, doppler - so this is radial velocity, determined through doppler (beat) frequency.

    2.  Targets return position (X, Y), Velocity (X, Y), Acceleration (X, Y). Velocity and Acceleration are determined by the tracker, and represent the absolute velocity and acceleration of the target, not the doppler/radial velocity.  The covariance and gating relate to the size and shape of the centroid.

    3.  The demo will return 3 types of TLV - Point Cloud (TLV 6), Target List (TLV 7), and Target Index (TLV 8).  Target Index is used to relate the point cloud to the target list.

    For more, please see the people counting TI Design, which goes in depth into the function and design of the people counting software.

    Regards,

    Justin

  • 0 in reply to Justin Curewitz
    Intellectual 600 points

    Hi Justin,

    - Ok, so I was wrong about velocity calculation for Point Cloud. I understood that the tutorial to calculate velocity using the angular velocity w was not the same as using Doppler which deals with a Doppler frequency which contains velocity information (like Constant Wave radars do to measure the speed of cars).

    - About the link in between Point Clouds and Targets, it is now clear for me how they are related, thanks for the details.

    Best regards,

    Anthony