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AWR6843AOP: Offset Phenomenon During Calibration of AWR6843AOP

WEN SEN LI
Prodigy 230 points
Part Number: AWR6843AOP

We have established a measurement site within the company and re-set the calibration file. And I have some questions.
1. During the measurement, we have aligned the center of the AOP to the center of the Corner Reflector, and the error appears stably at 0.043m, so why is there a phenomenon of downward bias when we use the GUI to look at the reflection point?
Is it a measurement error? Or a problem with the accuracy of angle inversion.

   

2. During the on-site measurement, it was found that the strength of the returned signal will show ripples and gradually decrease, and the reflection point of the 3D scatter plot will move in an oblique direction.
No matter how you adjust it, there will be an offset phenomenon. How can I solve it?


  • 0
    TI__Expert 3525 points

    Hi,

    We will look into this and provide update by early next week.

    Best Regards,

    Kevin

  • 0
    TI__Mastermind 39895 points

    HI, there:

    For your first question, there are two possibilities. 

    1) Measurement error: when you send range/phase calibration command, you enter the range for the target.  If the range you provide is not accurate, there will be an measurement error.

    2) System bias: the radar system has all the filters and it all introduce delay in the system, so it will cause a system bias in range estimation.   

    The 0.043 error you observe is the combination of the above two errors. 

    Best,

    Zigang

  • 0
    TI__Mastermind 39895 points

    Hi, there:

    For your second questio, it looks like an multipath effect to me.  That the first peak should be the true target at distance of x, and the rest of the peaks are just the multipath reflection (echo) at the distance of 2x, 3x, 4x and etc. 

    Let me know if this makes sense. 

    Best,

    Zigang