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CCS/IWR1642BOOST: How to find the amplitude of 2D FFT for IWR1642BOOST

HAIGANG ZHAO
Intellectual 780 points
Part Number: IWR1642BOOST

Tool/software: Code Composer Studio

I know that in the DEMO of IWR1642BOOST, log2Abs is obtained, and log2Abs is used to represent the amplitude value. However, we need to set a fixed threshold in the program, and need the amplitude value of 1D FFT or 2D FFT. The amplitude values of log2Abs and 1D FFT or 2D FFT are What is the connection? Or is there any conversion relationship between them? How do I find the amplitude of a 1D FFT or 2D FFT after knowing log2Abs? Because we set the amplitude value of 1D FFT or 2D FFT in the program, filter the excess false targets by the amplitude values of 1D FFT or 2D FFT, but we don't know the conversion relationship between them, please enlighten me, (I think Isn't it simple to ask for a logarithm?) Thank you.

  • Former Member
    0 Former Member

    Hello,

    For clarity can you please restate your question and objective?

    Amanda

  • 0 in reply to Former Member
    Intellectual 780 points

    Hi,

    I know that in the DEMO of IWR1642BOOST, log2Abs is obtained, and log2Abs is used to represent the amplitude value.The result of 2DFFT is a complex number, and the modulus value has a log2 relationship with LOG2ABS.

    Now that I know the value of log2Abs, how can I reverse the value of the Modulus ?

    Thank you

    ZHG

  • Former Member
    0 Former Member in reply to HAIGANG ZHAO

    Hello ZHG,

    The 1D FFT gives you range while the 2D FFT gives you velocity. In a typical processing chain which is implemented in the demo CFAR is used to determine detected objects using relative threshold. This generally provides for a more robust sensing with less variability due to environmental and scene changes.

    In any case you can just convert back to linear values from the log magnitude if your application requires it. These linear values are what comprised the detectionMatrix.

    Amanda