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IWR6843AOPEVM: Accuracy in distance measurements

Eyal Ron
Intellectual 295 points
Part Number: IWR6843AOPEVM
Other Parts Discussed in Thread: IWR6843, MMWAVEICBOOST, IWR6843AOP

Hi,

I've started working with IWR6843 AOP EVM.

in order to evaluate measuring capabilities and to find the relevant cfg for us, i've connected the evm through https://dev.ti.com/gallery/view/mmwave/mmWave_Demo_Visualizer_IWR6843AOP/ver/1.0.0/

As a basic test for distance accuracy, I've placed an object (30x30x3 box) at a fixed distance of 20 cm from the radar. I've also repeated this test with different objects at different distances. 

For some reason, I'm always getting a drift in the distance (e.g: 24 cm peak instead of 20 cm , 115cm peak  instead of 112cm, ext.)

is that the expected behavior? should I use a different configuration in order to get accurate distance from an object?

I've attached a screen shot and cfg file as exported from the visualizer along with a pic from the test setup.

Thanks,

Guyprofile (1).cfg

  • 0
    TI__Mastermind 40685 points

    HI, there:

    Yes, the range measurement has a system biasing.   You need to calibrate this offset.   You can look for "measureRangeBiasAndRxChanPhase" in the mmwave SDK users guide at: 

    C:\ti\mmwave_sdk_03_03_00_03\docs\mmwave_sdk_user_guide.pdf

    Best,

    Zigang

  • 0 in reply to zigang Yang
    Intellectual 295 points

    Hi,

     

    thanks for your replay.

    Im using  MMWAVEICBOOST carrier board and  IWR6843AOPEVM as the antenna module board.

    to try solving the original issue, I flashed the high_accuracy_68xx_demo_aop.bin (1.jpg) from mmwave_industrial_toolbox_4_2_0\labs\level_sensing\68xx_high_accuracy\prebuilt_binaries folder (see successful flash print screen).

    as stated in high_accuracy_user_guide.pdf, after flashing the bin file and moving to functional mode, I tried to use the on line visualizer (https://dev.ti.com/gallery/view/4768107/High_Accuracy_Visualizer/ver/1.1.0/) and run a level measuring test but for some reason, when uploading the chirp cfg file (high_accuracy_demo_68xx.cfg), I get an error message (2.jpg):

    "Error:Incorrect config reported by target. Hint: Change configuration and try again"

    I followed every step on the user guide but still cant get this demo to work. could it be a binary comparability issue with the silicon as stated in the pdf for ISK and ODS versions? 

     

     

    PS:

    - when running this visualizer, if I select the IWR6843AOP version and try to send any cfg file or on line cfg params, I get this error (4.jpg):

    "Selected Platform [xWR68xx_AOP] not matching that reported by target [xWR68xx]"

    - if I select IWR68xx platform type and send any cfg params, I get this error(5.jpg):

    "Error: incorrect config reported by target. Hint: Change configuration and try again"

    - if I flash back to the OOB demo binary - every thing works fine in the visualizer but Im still stuck on the original problem of non accurate distance measurements.

    please let me know if I missed any step or is it some kind of compatibility issue (my IWR68xx is ES 01.00).

     

    Thanks,

    Guy

     

     

     

  • Former Member
    0 Former Member in reply to Eyal Ron

    Hello,

    To answer your original issue please follow the calibration step to remove the range offset.

    To your second issue, the current 68xx high accuracy demo only supports ES2.0 6843 silicon.

    Amanda