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RTOS/AWR1642BOOST: Converting doppler bin to negative velocity

Samuel Miller99
Expert 1005 points
Part Number: AWR1642BOOST

Tool/software: TI-RTOS

I am trying to convert the doppler bin to velocity after collecting the doppler bin index via UART. After reading this post:  I expected the range of doppler values to vary from 0 to 15 (given I have 16 chirps per frame). However, I received some doppler indeces in the range 65528-65535. I presume these are the negative indeces, but I am unsure whether 65528 is the maximum negative velocity or whether 65535 is the maximum negative velocity. 65528 seems more frequent from my observations, so I presume this is the lowest negative velocity and 65535 is the maximum negative velocity? Could you please confirm

  • 0
    TI__Mastermind 30405 points

    Hi Samuel,

    The Doppler Index to Velocity conversion is described in 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 shown below:

    This means that a velocity index of 9 would be sent out as 9-16 = -7 and an index of 10 would be sent out as 10-16 = -6. So 65535 which represents -7 is a larger velocity than 65528 which is the lowest negative velocity.

    Regards

    -Nitin