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IWR1443: The bandwidth in distance resolution formula

Eric Wolf
Prodigy 120 points
Part Number: IWR1443

Hello ,

I have a problem when calculating the distance resolution.What is the bandwidth in the resolution formula?

As shown in the figure,  Is the bandwidth corresponding to the ADC sampling time（tag1） or corresponding to the entire rise time（tag2）.

Thank you

  • 0
    TI__Guru 50240 points
    Hi Eric,

    The bandwidth is going to correspond to Tag 2 indicating the entire rise time.

    The equation for range resolution is c/(2B) where c is the speed of light and 2B is two times the chirp bandwidth.


    Let me know if you have more questions at this time.


    Cheers,
    Akash
  • 0 in reply to Akash Gondalia
    TI__Prodigy 545 points
    Hi Eric,

    In terms of the occupied bandwidth for regulatory purposes, you need to include the entire rise time (tag 2); however, for the range resolution, you should only use the amount of bandwidth covered by the ADC sampling time

    B = S * Tadc * Nadcsamples

    S = frequency slope
    Tadc = ADC sampling period (1/ADC sampling frequency)
    Nadcsamples = # of ADC samples

    Regards,
    Brian