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AWR2243: 2*2243+2732: frequency mismatch calibration with DDMA transmit waveform

user5010824
Intellectual 340 points
Part Number: AWR2243

Hello, here we use 2* AWR2243+2732 Cascade  borad, the waveform here we use the DDMA , 6 transmitting antennas are used at the same time to transmit waves . Here we meet some problems in DOA. Our tests are shown below：

We tested four distances（25 m, 50 m, 75 m, 100 m）at 0° using a simulator.  And the 25m data is used to Calibrate the phase mismatch in our radar system.  However, the phase in other ranges is not right. The results are just shown below:

 

(1) In the figure, the 50m,75m,100m phase results is not in 0°，the 24 Virtual channels in chip 1 is almost identical, and the other 24 24 Virtual channels in chip 2 is almost identical. Here we do not know how to calibrate it.

(2) we also read the docs <signal_processing_4chip_cascade>, however, it is just useful for TDM-MIMO system. Here we use the DDMA wave form , it is not useful here. 

(3) Is TI have some method to solove this problem , thank you very much!

 

  • 0
    TI__Mastermind 20605 points

    Hi,

    Thanks a lot for your patience! Please find some further questions I would like to understand to support you better:

    • Is it possible to let me know how you are obtaining the calibration coefficients?
    • Can you also confirm if all your testing in this particular case was done under the same temperature conditions and on the same device/system?
    • Would it be possible to do some of these experiments with a corner reflector setup instead of a target simulator to eliminate any unknows from that end? This would reduce the focus of the debug just to the ADC data and phase mismatch obtained through your calibration measurement algorithm.
    • We have a block of code in our mmWave SDK demo (ver 4.4.1.2) which obtains the coefficients for a DDM based waveform as well. I would suggest you go through the same once.

    Regards,

    Kaushik