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IWR1642: Signal quality issue: why are there peaks in the whole doppler bins?

wang york
Intellectual 715 points
Part Number: IWR1642

I take IWR1642 outdoor tests and find some signal quality issue, please see the pictures below.

parameters: PRT = 27us, idle time 2us, adc st time 4us, sampling rate 6.25Msps, ramp time 25us, tx st time 0us, slope rate 5.5MHz/us， AGC gain 36

I found peaks across the doppler dimension, and it varies between different antennas. It seems RF problem, but I don't know why.

  • 0
    TI__Mastermind 37500 points
    Hello
    I agree that the captured data has some questionable information. Normally, if you were using the Out of Box Demo, for best range resolution, if we had a target at 6-10meters, about the size of a 12oz beverage can full of water / soda, we would expect to find individual Tx1 to Rx1, Tx1 to Rx2, Tx1 to Rx3, Tx1 to Rx4, that varies the range according to the superposition of the Tx length to Rx length.

    If the can is along the boresight centered between Tx1 and antenna and Rx1 antenna.
    We would have a Tx1 to Rx1 longest distance, and shorter distances for Rx2, Rx3, and Rx4.

    Are you using the Out of Box demo, mmwave SDK or the Radar Studio dfp software tool?

    Normally I would use two camera tripods, 1 - 2 meters above the ground, a tapemeasure, laser alignment, or premeasured cord will work for distance. The tape measure and sin cosine calculations are needed for the radial distance.

    As we normally measure small angular distances between the Rx heat map plots don't make sense, I need more information to try to replicate your experiment.

    Regards,
    Joe Quintal