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AWR1243 Cascaded Radar RF Evaluation Module(MMWCAS-RF-EVM) Azimuth MIMO, Elavation MIMO

suzukimon
Intellectual 290 points
Other Parts Discussed in Thread: MMWCAS-RF-EVM

Hello Ti engineer

We are studying Azimuth MIMO and Elevation MIMO using MMWCAS-RF-EVM.

The virtual antenna of Azimuth MIMO is considered to be arranged as follows.

Is this recognition correct?

Also, when we check the Tx of MMWCAS-RF-EVM, we think that Elevation MIMO uses the following Tx(U1_4 Slave Tx1, U1_1 Master Tx3, Tx2, Tx1), RX ARRAY A.

When using these Tx and Rx, we think that the virtual antenna of Elevation MIMO is as follows.

Is this recognition correct?

In this case, we think that the antenna is not continuous in the elevation direction. Is this correct?
What should we do to complement between the antennas at this time?

Regards,

suzuki

  • 0
    TI__Guru 58035 points

    Hello Suzukimon san,

    Please find below the Tx and Rx antenna spacing/arrangement details and also the effective virtual antenna array in azimuth and elevation.

    regards,

    Vivek

     

  • 0 in reply to Vivek Dham
    TI__Genius 17820 points

    Hi Suzuki, 

    I think your diagrams are correct. Yes, there are many overlapping virtual arrays. This is by design as it allows us to experiment with different phase recovery and compensation features which require overlapped, redundant elements.

    I plan on making an update to the MMWCAS-RF-EVM User Guide to make this mapping more clear. For now, please reference the attached physical AWRx device to physical antenna mapping diagrams and also the super-set virtual array diagrams here: awr12xx_cascade_v5_antennas.pdf

    The TX antenna, elevation offset is a minimum redundancy linear array. The elevation offsets are 0.5 lambda, 1.5 lambda and 1.0 lambda. Due to the larger than 0.5 lambda separation, the resulting AoA spectrum contains elevated side-lobes. No attempt has been made to suppress these side lobes in the example MIMO matlab processing scripts. 

    Thank you,

    -Randy

  • 0 in reply to Randy Rosales
    Intellectual 290 points

    Hello Vivek, Randy

    Thank you for the detailed explanation.
    It has become quite clear.
    We will check what you have taught us.

    Best Regards,

    suzuki