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CC2640R2F: To know details of AoA operation

Wilson Chen80
Intellectual 380 points
Part Number: CC2640R2F


Hi Experts,

First question from localization toolbox at website it mentions in AoA tuning section It mentioned that " data is collected when the turn table is set to 90 degree and the calculated angle vs. real angle are compared." What is meaning of the "turn table is set to 90 degree" ? Can you share the setup block diagram?

Second question is for compensation of the non-perfect 250Khz tone, it says every period is 45 degree of delay and the aggregated phase difference is 90 degree, but when perfect tone case there should be No phase difference. May I know why is that 45 degree big (a setting value or nature design value) and how to aggregate up to 90 degree?

Thanks a lot

Wilson Chen

  • 0
    TI__Mastermind 33460 points
    Hi Wilson,

    Were working on getting you information about the turntable
  • 0 in reply to Sean2
    Intellectual 380 points
    Thanks and looking forward the feedback.
    BTW, We want to tune the "offset" in the shielded room as well, so might have questions after your feedback comment/chart/steps

    Good day
  • 0
    TI__Guru 56475 points
    Regarding to the turntable, we don't have a diagram for that.
    But what you can imagine is that we have a control environment where the angle between aoa_sender and aoa_receiver is known.
    Let's say that I place the device with 45degree angle(real angle), then I get the I/Q sample and calculate the angle based on the I/Q data. If the calculated angle is not 45, then we add/minus/multiply some values to make it fit. We collect the data over -90 to +90 with 5 degree span. The tune the calculated value to reflect the real value.

    In the paragraph, it's using 45 degree as example. It's usually less. The number is really depends on the 24MHz xtal you are using.