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Original question:

IWR1443: Range resolution for level sensing field transmitter

IWR1443: Improving range accuracy for High Accuracy Measurement Lab on IWR1443

Nomo
Guru 16800 points
Part Number: IWR1443

Hello,

Do you have the way to improve the range accuracy?
In case of setting to detect 0m - 20m in cfg file, we could find about 5mm error in range of 0m - 8m.
For example, by setting to detect 5m - 10m, can we improve the range accuracy?

Best Regards,
Nomo

  • 0
    TI__Guru 50240 points

    Hi Nomo

    Is it possible for you to post pictures of your test setup? The main source of error will be disturbances around the sensor. We recommend ensuring the sensor in a fixed position with minimum exposure to disturbance and vibration.

    Limiting the range will not improve the 5mm measurement error but securing your test setup might. Also can you describe what kind of object or scene you are measuring against?

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    Guru 16800 points

    Hi Akash-san,

    We cannot post the pictures of our settings; because, they are confidentiality.
    We firmly fix the evaluation board and we are careful not to be affected by vibration.
    The following is the settings in the cfg file. We only change the RangeLimitCfg and evaluate the evaluation board.
    Do you have any concern for it?


    Best Regards,
    Nomo

  • 0 in reply to Nomo
    TI__Guru 50240 points

    Hi Nomo

    I have no concern over using the RangeLimitCfg but it is used to remove data that is detected outside the range of interest.

    I would need more information about your testing setup and procedure before commenting on accuracy.

    Regards,

    AG

  • 0 in reply to Akash Gondalia
    Guru 16800 points

    Hi Akash-san,

    The testing setup is following.

    Evaluation board installation: A fixing jig is attached to an aluminum table fixed to the floor and the board is fixed with screws.
    The measurement target is an aluminum plate. The aluminum plate is fixed to the bogie on the rail, making it less susceptible to vibration.
    The effect of external noise is unknown. It is not a measurement in as shield room or the like. However, the rails for the bogie and other obstacles have been protected against reflection with radio wave absorbers.

    Best Regards,
    Nomo

  • 0 in reply to Nomo
    Guru 16800 points

    Hi Akash-san,

    Do you have any update on this thread?
    It would really appreciate it, if you could have comments for the test settings.

    Best Regards,
    Nomo

  • Former Member
    0 Former Member in reply to Nomo

    Hello,

    With respect to your test setting using a flat plate you do have to ensure that the alignment is correct otherwise you risk deflecting away the return signal and affecting your SNR. This is why a corner reflector is more commonly used to avoid such concerns. However if you plate is aligned to reflect back to the EVM this should be OK.

    Can you provide more details on the accuracy you are achieving? 

    Please note you should be performing range bias calibration as noted in the SDK to resolve any static range offset error.

    With regards to designing a more ideal chirp please look at this thread to understand fundamentals of range accuracy: https://e2e.ti.com/support/sensors/f/1023/p/707391/2607546#2607546

    Amanda

  • 0 in reply to Former Member
    Guru 16800 points

    Hi Amanda-san,

    Thank you for your reply.
    If we had additional question, we'll create another post.
    Now, we close this thread.

    Best Regards,
    Nomo