AWR2243: AWR2243 cascade board, MIMO channel frequency calibration

Hi,

Please let us know which document this is?

Thank you

Cesar

Hi, 

I uploaded the document I saw. The formula is in section 3.3.2.1 of the document.

8.采用级联毫米波传感器的成像雷达参考设计 (Rev. A).pdf

Thank，

Hi,

          The principle is to calibrate the mismatch between various Antennas on the board to align the beam and angle accuracy. 

Regards

Hi,

   Can you provide the derivation process of the formula for our understanding.

thanks,

Hi,

We are checking with the systems team and will let you know

thank you

Cesar

Hi,

    thank you for your work!,

  We look forward to your reply.

thanks,

Hi,

    There is a variable N in this formula, which represents the number of ADC samples.

    My question are:

   1) N is the numer of ADC samples of calibration?  Or N is the numer of ADC samples of the FMCW chirp?

   2) In the TI calibration matrix acquisition procedure,  the number of ADC samples is 256.  If the number of ADC sampling points is not 256 when the board is applied, is the data calibration formula still applicable?

    We look forward to your reply.

    Thanks,

Hi,

You should use the same number of ADC samples for calibration if possible.

thank you

Cesar

Hi,

If the number of ADC sampling points for calibration is 256 and the numer of ADC samples of the FMCW chirp is 512. 

（1）In this case, can the formula be used to perform calibration? 

（2）If yes, should N in the formula be 256 or 512?

（3）If not, how to modify？

    We look forward to your reply.

    Thanks,

Hi,

Yes, calibration can be performed with N=512 if this is the number of ADC samples used for your use case.

I have also checked with systems team and if it not possible to use same number of ADC samples for calibration, we think that the value of N does not have significant impact.

Thank you

Cesar

Hi,

    According to your reply, Can we obtain the following conclusions:

（1）In practical application, the ADC points of the calibration data should be consistent with the ADC points of the data to be calibrated.    

（2）When it not possible to use same number of ADC samples for calibration. Within a certain range of differences, the value of N does not affect the final result. And the value of N can be consistent with the ADC points of the data to be calibrated?

We look forward to your reply.

 Thanks,