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AWR1843AOPEVM: Query Regarding Y-Coordinate Fluctuations in MRR Mode on AWR1843AOP

mitesh rajpurohit
Intellectual 290 points
Part Number: AWR1843AOPEVM
Other Parts Discussed in Thread: AWR1843AOP

Tool/software:

Hello TI Team,

I am currently using the AWR1843AOP and have successfully flashed the Medium Range Radar (MRR) demo with MRR mode enabled. The system is working fine overall. However, I have noticed fluctuations in the Y-coordinate of the detected object during movement.

For example, when I move in front of the radar starting from a distance of 15 meters, the Y-value jumps between discrete steps such as 15.0, 14.1, 13.6, and 12.5 meters, without intermediate values. This results in a somewhat choppy or non-smooth output. (note my speed is less than 0.5 m/s).

I am looking for a way to obtain smoother Y-coordinate values. Could you please suggest any configuration adjustments that could help improve this?

Thank you for your support.

Mitesh Singh

  • 0
    TI__Guru*** 147964 points

    Hi,

    I think that this behavior is due to a known issue related to angular accuracy.

    On the AWR1843AOP device, the angular accuracy is not optimal for larger angles. As a result the Y computation is not optimal.

    Unfortunately there are no simple configuration changes that can improve this behavior.

    Thank you

    Cesar

  • 0 in reply to Cesar
    Intellectual 290 points

    Thank you for your response and for pointing out the known issue related to angular accuracy on the AWR1843AOP device.

    I would like to clarify my test setup in relation to your feedback.

    In my testing scenario, I was moving directly toward the radar in a straight line, maintaining an angle of approximately 0 degrees relative to the radar's boresight. Given that this is a near-zero angle setup, I understand that the limitations in angular accuracy at larger angles should not significantly affect this case.

    Despite this, I am still observing non-smooth transitions in the Y-coordinate values. For example, while walking slowly (velocity < 0.5 m/s) from a distance of around 15 meters, the reported Y-values fluctuate in discrete steps such as 15.0 → 14.1 → 13.6 → 12.5 meters, without finer granularity.

    Could you please confirm whether such behavior is still expected even at 0-degree motion paths,



  • 0 in reply to mitesh rajpurohit
    TI__Guru*** 147964 points

    Hi

    Thank you for the additional information. I was not clear on the definition of Y axis.

    If you are moving at boresight, the behavior is caused by the range resolution which is about 1m. So the behavior is expected. 

    For the MRR demo, this is the best performance. The range resolution is related to the maximum range detected. To improve the range resolution one would need to reduce the detection range

    For more information about range resolution I recommend that you use google site search as follows:

    site e2e.ti.com range resolution

    Here are some search results:

    https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/1333187/iwr6843isk-range-resolution-and-range-accuracy-of-mmwave-sensor

    Thank you
    Cesar