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IWR1642: false object detect, if we use profile_advanced_subframe cfg files.

YiQin Chen
Prodigy 80 points
Part Number: IWR1642
Other Parts Discussed in Thread: MMWAVE-SDK

As is shown in the below graph, in the subframe configure range edge, the false object detection points are shown in the red circle ,how to fix it ? tks.

  • 0
    TI__Mastermind 30405 points

    Hi YiQuin,

    Can you please provide some information about your setup? If these are indeed false detections, they appear to be very close to the corresponding max ranges defined for the subframe chirps as given below from profile_advanced_subframe.cfg.

    % Max dist  m                                            8.44    33.75   93.75   186.41
    % Range resolution  m                             0.039  0.039   1.002   0.498


    Do you see these detections at the corresponding distances if you try the chirps individually i.e. each of the four profile configurations one-by-one without using advanced subframe configuration?

    Regards

    -Nitin

  • 0 in reply to Nitin Sakhuja
    TI__Mastermind 30405 points
    Hi YiQuin,

    We have not heard back from you on this topic. Could you please reply whether you still need support on this topic?

    Thanks
    -Nitin
  • 0 in reply to Nitin Sakhuja
    Prodigy 80 points

    yes,the false detection points are closed to the max range,if we do 1D range fft, the max range bin of output spectrum will have some peak points.Why are there these points?

  • 0 in reply to YiQin Chen
    TI__Mastermind 30405 points

    Hi YiQuin,

    The peaks near max range are caused due to the wrap-around effect in the range FFT. It is recommended to use about 85-90% of the max range which is defined by the number of adc samples in the profileCfg command. This can be controlled by setting the start and end range indexes in the peakGrouping commands corresponding to the respective profileCfg commands as shown below. Please refer to the MMWAVE-SDK users guide in section 3.4 - Configuration File Format (search for peakGrouping) for more details.

    profileCfg 0 77 6 2 50 0 0 80 1 240 5000 0 0 30
    profileCfg 1 77 6 2 198 0 0 20 1 960 5000 0 0 30
    profileCfg 2 77 5 5 29 0 0 7.2 1 104 5000 0 0 48
    profileCfg 3 77 5 5 90 0 0 3.621 1 416 5000 0 0 48

    peakGrouping 0 1 1 1 1 216
    peakGrouping 1 1 0 0 1 864
    peakGrouping 2 1 0 0 1 93
    peakGrouping 3 1 0 0 1 374

     

    Please mark this thread resolved if your question was answered.

    Thanks

    -Nitin