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MMWCAS-RF-EVM: Inconsistent frame definition for MMWCAS-RF-EVM

Hang
Intellectual 765 points
Part Number: MMWCAS-RF-EVM
Other Parts Discussed in Thread: MMWCAS-DSP-EVM,

Hello,

I was using MMWCAS-RF-EVM and MMWCAS-DSP-EVM for raw data capturing using mmwave studio 3.

I was confused about the frame definition of the MMWCAS-RF-EVM board. I created a post here, somehow I was not allowed to reply to that post any more. 

I did more tests, it confused me more. Here are what I did.

(1) Here is my test setup. The strong corner reflector was higher than the radar. 

(2) I used the TI default given code below for processing the raw data. 

C:\ti\mmwave_studio_03_00_00_14\mmWaveStudio\MatlabExamples\4chip_cascade_MIMO_example

From above, I can see that the range-azimuth heatmap is consistent with the setup scene. The point cloud plot somehow is right-left flipped?

Other than that from my test, the radar forward is +Y, to right is +X, up is +Z. 

However, the frame definition of "AWRx Cascaded Radar RF Evaluation Module.pdf" was given as below, which is absolute different. 


My question are that

(1) Where is the origin point located on the RF board when the raw data was processed with the given code, namely 4chip_cascade_MIMO_example?

     Is there any reference figures on how those 3D points were calculated?

(2) If the origin point is the same with Figure 11 above, how Figure 11 was related to the frame that being used for 4chip_cascade_MIMO_example?

Thanks a lot for the help!

Best,

Hang

  • 0
    TI__Genius 13805 points

    Hi,

     The origin points clarification along with axis interpretation has been commented in previous thread. 

    In my view important is where you calibrate your Antennas, you may keep the origin in between the block and then accordingly the data would be processed.

    Regards

  • 0 in reply to Abhed Misra
    Intellectual 765 points

    Hi Abhed,

    Thanks for reply. 

    (1) Actually, I think the clarification of origin point with axis was not correct. Because the the y and z was not simply reversed, the positive direction of x was not consistent, neither. Any suggestions?

    (2) What do you mean "you may keep the origin in between the block", what "block" refers to here?

    I believe the origin point with axis was not chose randomly for Figure 11 below. 

    Let me ask in this way. Why TI choose that origin point on the RF board (Figure 11) instead of other locations? Any reason or references?

    Thanks a lot!

    Best,

    Hang

  • +1 in reply to Hang
    TI__Genius 13805 points

    Hi,

     1) The interpretation of x,y and z is arbitrary in comparison to figure and plot. Yes, the point cloud is flipped in the x axis comparing to the heatmap.

    2) What I meant was ideally it really doesn't matter where you keep the origin. Ultimately you are going to calibrate the TX's and RX's at far distance object in controlled environment. The origin was not chosen randomly it has to be aligned with your antenna patches. But at the same time figure 11 talks about origin kept at block A, doesn't mandate that you also keep the same, you can keep the origin at block B too, but you have to ensure you calibrate out all TX and RX antennas for phase.

    There is no relation of frame data and origin.

    Regards

  • 0 in reply to Abhed Misra
    Intellectual 765 points

    Hi Abhed,

    Thank you very much!

    Best,

    Hang