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IWR6843ISK-ODS: about lab25, the distant data is smaller than infact

sir li
Intellectual 340 points
Part Number: IWR6843ISK-ODS
Other Parts Discussed in Thread: IWR6843

Dear Mr. or Ms.

Thanks for your supports.

Now, We are testing on IWR6843ISK-ODS EVM board. run the lab25-IWR6843-ods point cloud lab. after tested, we find that the distance between the object and antenna is smaller than in fact.

example,in face the distance between the object and antenna is 2.17m; but the caculate data is about 1.77m (x=0.83, y=1.44, z=0.609); according to the data, specially, the y is more deviation.

Does the IWR6843ISK-ODS need to calibrate? how to calibrate?

  • 0
    TI__Mastermind 30405 points
    Hello,

    Can you please confirm whether you see this behavior with the pre-built binary provided with the lab or only with the binary compiled using the provided CCS projectspec?

    Regards
    -Nitin
  • 0 in reply to Nitin Sakhuja
    Intellectual 340 points

    Dear Nitin,

    Thanks for your supports.

    Yes, this behavior is with pre-built binary provided with the lab; 

    this file is in lab0025_ods_point_cloud_demo_68xx\prebuilt_binaries\ods_point_cloud_68xx.bin

  • 0 in reply to sir li
    TI__Mastermind 30405 points

    Hello Li,

    Thanks for providing additional information. Please allow me a few days to look into the issue. I should have a response for you by Tuesday next week.

    Regards
    -Nitin

  • 0 in reply to Nitin Sakhuja
    TI__Mastermind 30405 points

    Hello Li,

    Thanks for your patience. I was able to reproduce the problem and found a bug in the range resolution computation which resulted in incorrect range calculation.We will include this fix in the next release of mmWave Industrial Toolbox. In the meantime, I have attached the updated lab zip file which includes the updated code and pre-compiled binaries. Please test this version and let us know if you see any issues.

    Thanks for reporting the problem.

    Regards

    -Nitin

    /cfs-file/__key/communityserver-discussions-components-files/1023/lab0025_5F00_ods_5F00_point_5F00_cloud_5F00_demo_5F00_68xx.zip

  • 0 in reply to Nitin Sakhuja
    Intellectual 340 points

    Hello Nitin,

    Thanks for your supports,

    after download the update "prebuilt_binaries", some points location x=-24, y=-24, z=-24.  but the range is 1.3664; 

    Could you tell us the detail formait of x/y/z?

  • 0 in reply to Nitin Sakhuja
    Intellectual 340 points

    Hello Nitin,
    Thanks for your supports,
    After download your pre-compiled binaries, the location of x/y/z is correct; IWR6841ISK-ODS EVM is overhead above 3m; the chirp_configs is defaut file "profile_iwr6843_ods_3d.cfg"; 

    >if detect the object and the y of object is les than 2.95m (3m-0.5m), we think detect a object.

    during a people walk forwad into the IWR6843-ODS centre, ODS can detect the people he distance is about 5m from the centre;
    when the people walk forward into the IWR6843-ODS centre and stop at 5.5m which is from the centre. the ODS can detect the people at 5.5m;
    walk speed is about 1m/s

    >if detect the object and the y of object is les than 1.9m (3m-1.1m), we think detec a object.

    during a people walk forwad into the IWR6843-ODS centre, ODS can detect the people only the distance is about 2m from the centre;
    when the people walk forward into the IWR6843-ODS centre and stop at 5m which is from the centre. the ODS can detect the people at 5m;
    We hope the detect distance is longe when people is walking with y<1.9m; could you please how to tune this?



  • 0 in reply to Nitin Sakhuja
    Intellectual 340 points
    Dear Nitin,
    Thanks for your supports,
    After tested the bin from you;
    the most points are correct;
    but a little fale points appear;
    example, A people is walk along Z-axis, and X=-0.5m;
    most points are right, X of these points is -0.5m;
    but there are a little points are not correct, X of thes points is 1.6m;
    have change the SNR threshold to big; the range is shorter; but there are still false points.
    there is no anything under the antenna.
    thanks for your supports.
  • 0 in reply to sir li
    TI__Mastermind 30405 points

    Hello Li,

    If you have a very strong reflector especially at such close distance,  there could be the possibility of harmonics. Also, note that the IWR6843ISK-ODS module antenna has a wider field of view (both azimuth and elevation), therefore the possibility of multi-path/stray reflections is also increased.

    You can try to reduce the RX Gain and/or TX power backoff in the profilecfg command. As mentioned in the SDK user guide, the valid values for these are defined in the mmwavelink documentation which you can find here:

    Top level documentation page: C:/ti/mmwave_sdk_03_01_01_02/packages/ti/control/mmwavelink/docs/doxygen/html/index.html

    profilecfg structure: C:/ti/mmwave_sdk_03_01_01_02/packages/ti/control/mmwavelink/docs/doxygen/html/structrl_profile_cfg__t.html

    Regards

    -Nitin