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IWR6843ISK: measurement accuracy of angle estimation through capon beamforming

PJ
Prodigy 110 points
Part Number: IWR6843ISK

Hello,

I have a question about measurement accuracy of angle for positioning.

I captured the rawdata using DCA1000 and IWR6843ISK, and I used only tx0, tx2, rx1, rx2, rx3, rx4 (not use tx1).

I performed range FFT, clutter removal, capon beamforming and decided angle resolution as 1 degree.

Also I captured the data for 200 frames.

Below image is the result of positioning.

I wonder the reason that the left and middle position are very accurate but the right position is not accurate.

The estimated angle is more on the right than the real position (yellow point).

The phenomenon happens when the radar is upright and and tilted.

Thank you.

  • 0
    TI__Mastermind 37780 points

    Hi,

    How large is this error? It doesn't appear to be more than a few degrees.

    Additionally, are these results replicable? If you move the radar slightly and the corner reflectors slightly, do you get the same results?

    Finally, where is the radar placed in this scenario and how far down is it tilted?

    Best,

    Nate

  • 0 in reply to Nathan Block
    Prodigy 110 points

    The error is about 5 degrees and it is changed depending on the radar position.

    And these results are replicable because i experimented many times, changing the radar position.

    The radar is placed at 0 on the x-axis and tilted about 10 degrees.

    However i checked the same results when the radar was not tilted.

    I wonder that the point that the right position has error while the left and middle position are very accurate.

    Thank you.

  • 0 in reply to PJ
    TI__Mastermind 37780 points

    Hi,

    Have you tested on multiple EVM's? This sounds like it may be an antenna issue.

    Best,

    Nate