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AWR2944: The radar has a very high value in adc data

?? ?
Prodigy 100 points
Part Number: AWR2944

Hi

     We meet a problem about a abnormal value in adc data.

    Scenario:: A car has two radars, one on the front right with an upper chirp (positive slope rate) and the other on the front left with a lower chirp (negative slope rate), and we find that in the adc data of the radar, there is a very large value that is almost saturated, this value is about 30000, this outlier is present in almost every frame

Thanks 

Patrick

  • 0
    Prodigy 100 points

    Is this scenario caused by interference or other reason?

  • 0 in reply to ?? ?
    TI__Guru 69970 points

    Do you observe only when both devices are on actively framing?

    Avoid having common scene for both of the devices.

    .

    Regards,

    Jitendra 

  • 0 in reply to Jitendra Gupta
    Prodigy 100 points

    Hi Jitendra

          Thanks for your apply, there are some updates: if only one radar active, it still has this phenomenon: has a abnormal value in adc data. Why does this abnormal value generated?

  • 0 in reply to ?? ?
    TI__Mastermind 20605 points

    Hi Patrick,

    Interference could have explained in the case of 2 sensors framing. I would need more info here:

    1. In case of 2 sensors:
      1. Is the ADC data on both the devices experiencing this issue?
      2. Are you performing any interference mitigation here?
        1. Are you performing interference stats, localization and mitigation on the HWA or the DSP?
        2. What method are you using for the interference detection and mitigation?
      3. How are you triggering the synchronization of the 2 sensors?
      4. Can you provide a timing diagram of the chirps and chirp processing between both the devices?
    2. In case of only one sensor:
      1. Is it always happening on the same sample or a different sample? (Where sample is the bin number of the ADC data)
      2. Does it occur if you change the device sample or another EVM?
      3. Are you using TI EVM or your custom board?
      4. Are you observing this phenomenon if you change your scene?
      5. Are you able to see this spiked ADC data if you change your chirp design (say slope or bandwidth by a small degree)?
      6. Have you streamed the data via LVDS using the demo or mmWave Studio?

    .

    Regards,

    Kaushik

  • 0 in reply to Kaushik Gowda
    Prodigy 100 points

    Hi Kaushik

        Thanks for your reply,

        We collect about 300 frames, almost all the frames have abnormal value, but one frame may only has 1/2 abnormal value

        In case of only one sensor:

    1. Is it always happening on the same sample or a different sample? (Where sample is the bin number of the ADC data): 

             It happening in different sample(I think it's random)

    1. Does it occur if you change the device sample or another EVM?

             Yes, it occurs in different device  sample 

    1. Are you using TI EVM or your custom board?

             We are using our custom board

    1. Are you observing this phenomenon if you change your scene?

             We meet this phenomenon in other scene

    1. Are you able to see this spiked ADC data if you change your chirp design (say slope or bandwidth by a small degree)?

             Currently we didn‘t change the chirp design, but if we have chance, we will try it.

    1. Have you streamed the data via LVDS using the demo or mmWave Studio?

           Yes, we streamed the data via LVDS

    Thanks

    Patrick

  • 0 in reply to ?? ?
    TI__Mastermind 20605 points

    Hi Patrick,

    Thank you for your inputs.

    • Would it be possible to try a data capture with the same config on a TI EVM once?
    • Let me know once you have experimented with different chirp profiles.
    • By LVDS I meant whether as part of the demo or a single file mmWave Studio capture?

    Regards,

    Kaushik