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AWR1642: How to design the SNR of receive signal?

jerry zhang
Prodigy 90 points
Part Number: AWR1642

Hi,

    I have read a pdf. named "Introduction to mmwave Sensing: FMCW Radars". In 50th slide, there is a SNR equation:

                                          SNR=rcs*Pt*Gt*Gr*lamda^2*Tmeans/{(4pi)^3*d^4*k*T*F}

I would like to know, in the equation,  does only "Tmeans" relate with the Chirp parameters? Is that means the bandwidth of Chirp doesn't matter with SNR?

  • 0
    TI__Prodigy 545 points
    Hi Jerry,

    Tmeas is the total observation time within a frame. This is the number of chirps times the ADC sampling window within each chirp.

    You are correct that the chirp bandwidth does not directly impact SNR in the above equation, which considers only additive white Gaussian noise. In the presence of multiple objects, however, higher chirp bandwidth provides better range resolution, so you might be able to more easily distinguish between your desired signal and reflections from other undesired targets or clutter.

    Regards,
    Brian