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CCS/IWR1642BOOST: What is Range index, Doppler index and peak value?

Arpit Patel
Expert 2040 points
Part Number: IWR1642BOOST
Other Parts Discussed in Thread: IWR1642

Tool/software: mmwave demo visualizer

Is it same value of range and velocity? If not in data structure where do i find distance and velocity?

  • 0
    TI__Mastermind 30405 points
    Hi Arpit,

    The meaning/interpretation of these quantities is defined in the SDK demo doxygen documentation at C:\ti\mmwave_sdk_02_01_00_04\packages\ti\demo\xwr16xx\mmw\docs\doxygen\html\index.html

    As explained in the documentation, the Range and Doppler Index are the 1D and 2D FFT-bin indices for the detected object and are converted to the corresponding physical quantities by multiplying with the corresponding resolutions. This conversion is done by the mmWaveDemoVisualizer.

    So essentially:

    Range in metres = Range Index * Range resolution (for the configured chirp)
    Velocity in m/sec = Doppler Index * Doppler resolution (for the configured chirp)

    Look at the following post to understand peak value: e2e.ti.com/.../622722

    Thanks
    -Nitin
  • 0 in reply to Nitin Sakhuja
    Expert 2040 points

    If i am getting a value FC FF(64767) which is 2 bytes of doppler index and radial velocity resolution is 0.13 which i have set in demo visualizer. It means 64767 * 0.13 = 8419.71 m/s. I don't think this is correct.

    And if I want to find an angle how do i find it?

    What is the practical limit of distance, velocity and angle in iwr1642? Because I am not getting man detection after 6-7m.

  • 0 in reply to Arpit Patel
    TI__Mastermind 30405 points

    It's a signed value where a negative index value means that the object is coming towards the sensor and a positive value means that the object is going away from the sensor.

    Refer to this thread for a similar question:  RTOS/AWR1642BOOST: Converting doppler bin to negative velocity

    Again, I would recommend you to go through the SDK user guide at

    C:\ti\mmwave_sdk_02_01_00_04\docs\mmwave_sdk_user_guide.pdf

    and the mmw demo doxygen documentation at:

    C:\ti\mmwave_sdk_02_01_00_04\packages\ti\demo\xwr16xx\mmw\docs\doxygen\html\index.html

    as these fundamental aspects are very well explained there including the angle of arrival computation.

    -Nitin 

  • 0 in reply to Nitin Sakhuja
    Expert 2040 points

    I am using sdk 2.0.0.4.Is there any GUI other than demo visualizer or any tactics develop by ti through which I an show these distance,velocity and angle in to decimal form?Because I have to show these values to our boss and customers in a simple form.

    I am able to find rangebins ,Adcsamples and no of chirps per frame. Where do I find it?