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IWR6843AOPEVM: Best practices for calibration

Eymen Gunay
Prodigy 60 points
Part Number: IWR6843AOPEVM
Other Parts Discussed in Thread: IWR6843ISK, IWR6843AOP

Hello,

We are testing IWR6843AOPEVM which we recently purchased. We have 4 boards and we have noticed differences in the output. Searching in E2E TI portal we realized that the boards need to be calibrated to obtain best performance and to lessen the differences across boards.

In the past we had done some tests with IWR6843ISK, which also needed the calibration step. We managed to successfully calibrate and improve the output. However we noticed that the same calibration procedure we used didn't give us a better output with IWR6843AOPEVM.

Are there any suggestions you can give us, anything specific that we need to know such as reflector material, the optimal distance to the reflector etc. ?

Thank you!

  • 0
    TI__Mastermind 23725 points

    Hello

    Can you please help us understand  what are the calibration steps that you have tried and do not work well on the IWR6843AOP board.

    Would also help to know what is user as metric used for comparison.

    Thank you,

    Vaibhav

  • 0 in reply to Vaibhav Mahimkar
    Prodigy 60 points

    Hello Vaibhav,

    Thank you for your prompt response.

    We simply tried positioning a rectangle piece of metal (which was also painted on) on the table and put the radar at a meter distance from it. We then launched the out-of-box demo with the calibration profile set to the correct distance and let it run until we obtained around 200 lines of "compRangeBiasAndRxChanPhase" strings.

    Once it was done we picked out one of these strings randomly and inserted it in the configuration file. While on ISK boards this process gave us pretty noticeable differences before and after the calibration (using the sense-hvac firmware), with AoPEVM we couldn't get any output using overhead detection firmware.

    As we do not have a reference point we can't be sure whether the result we are obtaining from AoP boards are already close to their max. limit or not but we were at least hoping to see some differences after setting the compRangeBiasAndRxChanPhase in the config.

    We are not sure whether this procedure we followed is correct, but it happened to improve things for ISK boards.

    Thanks again,

    E. Gunay

  • 0 in reply to Eymen Gunay
    TI__Mastermind 25835 points

    Gunay,

         You may need to create a some sort of "controlled environment" for the calibration, It is possible if the environment has multiple reflecting elements they may mess up the calibration, You need to have strong target (If there are other stronger object which reflects higher energy then it would be problem) for the calibration. Corner reflector should be in far field, 1-3meter would be ok, if it's more than that reflected energy would be weaker and if there are strong targets then it would pickup and mess-up the calibration.

    Also AOP has higher field of view as compared to IWR6843ISK designs, hence there could be higher chance of picking wrong targets for the calibration. 

    Please review below E2E post on the setup for this problem.

    https://e2e.ti.com/support/sensors/f/1023/p/892202/3303979#3303979