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  • TI Thinks Resolved

IWR1443: The bandwidth in distance resolution formula

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Replies: 2

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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

  • 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
  • In reply to Akash Gondalia:

    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

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