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IWR6843AOPEVM: Abnormal signal on RD

Pengfei Jiang
Prodigy 170 points
Part Number: IWR6843AOPEVM
Other Parts Discussed in Thread: IWR6843AOP, AWR1243

Hi, 

I'm capturing data with mmwaveStudio 2.1.0 from IWR6843AOP with the default configuration script `\DataCaptureDemo_xWR.lua`. The radar is placed in a darkroom proved scilent with AWR1243, yet an abnormal signal appeared on 6843 RD image as shown below. It appears on certain range bins across a wide span of Doppler. I wonder if you could provide any debugging suggetions.

Also, could you please confirm that for continuous streaming mode, does the device begin transmission after I click enable button from mmwaveStudio? I mean to have it transmitt only without capturing. The manual seems unclear to me.

Regards

RD abnormal

  • 0
    TI__Mastermind 40495 points

    Hi, there:

    For your first question, for the AOP board, we have seen some higher noise at lower IF frequency (below 1MHz).  Not sure whether your observation is the same issue.  Can you rotate heatmap figure to view the heatmap in amplitude over range (Different Doppler bin on top of each other) and show me?   We have been debugging this and we know it is related to the EVM not AOP device because the characterization board build for AOP does not have the same issue.   I will ask the team to get the latest status.

    Regarding your second question in continuous mode, the data will start sending when you start capture. 

    Best,

    Zigang

      

  • 0
    Prodigy 170 points

    Hi zigang,

    Sorry for the lage reply. Here's the Ragne dimension profile of the RD heat map. The signal indeed happens at  several range bins at low IF frequency.

    In this case we see have some static reflection at 23th range bin and further. No window applied so the signal leask into the adjacent doppler bin. The higher noise appears at range 8, 13, 106 and 103 accross all Doppler

  • 0 in reply to Pengfei Jiang
    TI__Mastermind 40495 points

    HI, Pengfei:

    Yes, this is the same noise hump we have observed as well.    We are able to identify the root cause of this noise hump, which is the PMIC.  Currently we are still in the process of optimize the design.  

    Best,

    Zigang