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DCA1000EVM: Zeros in data cube

John Lee35
Prodigy 70 points
Part Number: DCA1000EVM
Other Parts Discussed in Thread: AWR1642BOOST

Hi,

I'm using the DCA1000EVM with the AWR1642BOOST. I have configured the radar to capture 3000 ADC samples per chirp, receiving from all 4 receivers, 200 chirps in a frame, and captured 50 frames. I'm observing that I'm consistently getting 952 (3000 - 2048 = 952) trailing zeros for the 4th receiver. I also suspect that some of those 952 samples are flowing over to subsequent chirps.

Under what circumstances should I be expecting zeros in my captured data cube?

Thanks and Warmest Regards,

John

  • 0
    TI__Guru*** 148944 points
    Hi,

    Please read Section 3 in the mmwave_studio_user_guide.

    The data is zero filled when frames are missing.

    Your data rate requirements are higher that the bandwidth supported and that's why there are some frames dropped. There is a zero fill utility that will fill in dropped frames with zeros

    Please try to reduce the number of samples and you will notice that there are no more zeros.

    thank you
    Cesar
  • 0 in reply to Cesar
    Prodigy 70 points
    Thanks!

    How big are the frames that are dropped? Is the rest of the data unaffected by the dropped frame or would the rest of the data have been shifted?

    John
  • 0 in reply to John Lee35
    TI__Guru*** 148944 points
    the frames are dropped at the Ethernet UDP level. So, the frames are UDP frames. The non-dropped frames are not affected. You should be able to see the size of the frames based on the number of zeroes added.

    Let me check if I can get more information

    thank you
    Cesar
  • 0 in reply to Cesar
    TI__Guru*** 148944 points
    Hi,

    Information about dropped frames is provided in the log which has following format:

    ar1.PacketReorderZeroFill("C:\\ti\\mmwave_studio_01_00_01_00\\mmWaveStudio\\PostProc\\adc_data_Raw_0.bin", "C:\\ti\\mmwave_studio_01_00_01_00\\mmWaveStudio\\PostProc\\adc_data.bin", "C:\\ti\\mmwave_studio_01_00_01_00\\mmWaveStudio\\PostProc\\pktlogfile.txt")
    [14:19:06] [RadarAPI]: Packet Reorder Utility process completed!
    [14:19:11] Reordering required : NO
    [14:19:11] Packet loss : NO
    [14:19:11] Number of packets received : 10803
    [14:19:11] Number of zero filled packets : 0