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IWR6843ISK: Out of the box demo output offset

Guilherme Amaral87285
Prodigy 85 points
Part Number: IWR6843ISK
Other Parts Discussed in Thread: IWR6843

Hello,

I'm using an IWR6843 radar in order to detect a target. Detection occurs, however the data appears to have a positive offset in Z.

Is there supposed to be some kind of calibration for this application?

Is any angle compensation being done? I have my radar perpendicular to the ground.

Best regards,

--

Guilherme 

  • 0
    TI__Expert 7510 points

    Hello,

    I assume that you have successfully ran the OOB demo with no issues other then the offset that you have mentioned. From you have stated it appears that there is a delta between what the sensor is stating the range is and what the sensor height is above the ground. I would suggest following the procedure outlined in the following resource:

    OOB Documentation for 68xx: - Range Bias and Rx Channel Gain/Phase Measurement and Compensation
    <MMWAVE_SDK_INSTALL_PATH>\packages\ti\demo\xwr68xx\mmw\docs\doxygen\html\index.html

    If you have a corner reflector for the calibration this would be ideal, but a strong RCS (Radar Cross Section) object would be needed. After applying this range estimation and inaccuracies due in angle estimation should improve.

    Best regards,
    Connor Desmond

  • 0
    Prodigy 85 points

    Hello Connor,

    What are the recommended dimensions for the corner reflector? Do you have an example of the preferred shape? 


    Can I use a PLA (or other printable material) printed part?

    Thanks! Best regards,

    Guilherme 

  • +1 in reply to Guilherme Amaral87285
    TI__Expert 7510 points

    Hello,

    The key thing here is that the object that you are using to calibrate has a relatively high RCS. Any corner reflector should work (higher RCS the better), but if you don't have one maybe try out something metallic and see if you see improvement in your measurements. Also the environment that your calibrating in should be free from other reflecting objects, try an open space.

    Best regards,

    Connor Desmond

  • 0 in reply to Connor Desmond
    Prodigy 85 points

    Hi Connor,

    I printed a target (a corner reflector, with PLA) and proceeded with the calibration. In fact, the result has improved.

    Thanks for the help!

    Best regards,

    Guilherme