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AWR1642BOOST: Range, Doppler and, Angle bins meaning and Usage in SRR code

vamshi jaida
Prodigy 30 points
Part Number: AWR1642BOOST

Hi,

we are using awr1642 boost SRR code, code is having fixed Configuration and it has NumRangeBins = 256, NumDopplerBins = 64 and, NumAngleBins = 32. The following are some clarification required from you. 

1. what is the actual meaning of Range, Doppler and, Angle bins.

2. What is the importance of Range, Doppler and, Angle bins in the calculation of Windowing and FFT.

3. How can you say that the 80m range can be achieved using Chirp and Frame configuration parameters used in the SRR code.

Thanks & Regards

J Chandra Vamshi

  • 0
    TI__Guru*** 149204 points
    Hi,

    Since FFT is the main signal processing block used in radar processing, I think that it would be helpful to review some of the FFT processing fundamentals. Please search on this forum or on the internet for "FFT frequency bins"

    Please also review our mmwave training series to understand how FFT is used for range, velocity and angle processing

    training.ti.com/mmwave-training-series

    Regarding the chirp configuration, please review the chirp configuration AppNote and the Sensing Estimator

    www.ti.com/.../swra553.pdf

    dev.ti.com/.../

    Thank you
    Cesar
  • 0 in reply to Cesar
    Prodigy 30 points

    Hi Cesar,

    Thanks for your reply. Please clarify whether my understanding is correct.
    1. frequency bins are intervals between samples in frequency domain. For example, if your sample rate is 100 Hz and your FFT size is 100, then you have 100 points between [0 100) Hz. Therefore, you divide the entire 100 Hz range into 100 intervals, like 0-1 Hz, 1-2 Hz, and so on.
    2. NumRangeBins means, total sample frequency is divided into NumRangeBins samples and RangeIdx represents what range bin the range value is in. Similarly, the NumDopplerBins and NumAngleBins.


    Thanks & Regards,
    J Chandra Vamshi.