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IWR1443BOOST: IWR1443 calibration and alias velocity detection

Karl Nordin
Prodigy 160 points
Part Number: IWR1443BOOST
Other Parts Discussed in Thread: IWR1443

Hello,

I have two questions regarding different topics.

1, With the new SDK version you have a method to detect and correct and velocity aliased objects with 2 Tx and only azimuth using the xWR1642.
Do you have any similar methods using 3 Tx and elevation angle?

2, Is there any reason to recalibrate the IWR1443BOOST for better performance of the beamforming, or is the one done stock enough?

Thank you,

Karl Nordin

  • 0
    TI__Mastermind 30405 points
    Hi Karl,

    1. No, the MIMO based 2x velocity extension is available only for 2TX on the 1642 platform.
    2. Due of imperfections in antenna layouts on the board, RF delays in SOC, etc, the sensor needs to be calibrated to compensate for bias in the range estimation and receive channel gain and phase imperfections. The OOB demo provides a Range Bias and RX Channel Gain/offset measurement and compensation procedure as described in section 6.8 of mmwave_sdk_user_guide.pdf. The implementation details of the calibration procedure are available in the 16xx OOB demo doxygen documentation under <mmwave_sdk_ver>/packages/ti/demo/xwr16xx/mmw/docs/doxygen/html/index.html#calibration

    Please note that IWR1443 doesn't support TX beam-forming (It supports 0/180 degree binary phase modulation for interference rejection and/or PN sequence coding for simultaneous MIMO operation).

    Regards
    -Nitin
  • 0 in reply to Nitin Sakhuja
    Prodigy 160 points

    Hello Nitin,

    1, So if I understand correctly there are no methods to detect and compensate aliased velocities for 3 Tx with elevation. So in the case of aliased velocitys both the velocity and due to phase errors, the azimuth and elevation angle will be incorrect.

    2, Does this calibration requirement also include when using the iwr1443boost + TSW1400 data capture board?

    If I understood correctly I measure with a reflector located at 0 azimuth angle and 0 elevation angle. It should correspond to equal phase and magnitude in all 12 antennas in that range/doppler bin when calibration has been performed?
    Also does it need to be recalibrated if I change the ramp configuration e.g. 500 MHz chirp at 77 GHz to a 1 GHz chirp at 79 GHz.

    Thank you for your answer

    Regards
    Karl