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Original question:

AWR2243: MINO Antenna layout pattern in the reference document: Design Guide TIDEP-01012

AWR2243: question of the Rx Azimuth angle resolution in TXBF mode

Youngjoon So
Prodigy 95 points
Part Number: AWR2243

Dear support team.

As mentioned above, only 16 RX antennas are valid in the beamforming mode, but I am curious to see how the azimuth angle resolution of the same '1.4 degree (with multiple beam steering)' as in the MIMO mode is possible.

Is it a method to find the angle by simply checking the presence or absence of the Rx reflected signal by the Tx beamforming angle? (If so, I think a smaller resolution would be possible)
Or is there any other calculation that combines 16 Rx antennas and 9 Tx antennas in the Azimuth direction to give 1.4 degree resolution?

In TXBF mode, it seems that  the angle is obtained by digital Rx beamforming without an additional phase shifter in the Rx chain (refer to page 18). I would like to know the process of calculating Rx resolution through Rx beamforming in the digital domain.

Thanks.

  • 0
    TI__Guru*** 140784 points

    Hi,

    Angular resolution is defined by the number of Rx antenna as described in the MIMO Radar AppNot. So it would not be possible to reach the 1.4 degree angular resolution with 16Rx

    Thank you

    Cesar

  • 0
    Prodigy 95 points

    Thank you for your reply.

    I understand the contents of the MIMO radar appnote and know that it cannot have a resolution of 1.4 degrees with 16 Rx.


    What I want to know about is the part where the angle resolution of TXBF is 1.4 degrees on page 4 of the document "Imaging Radar Using Cascaded mmWave Sensor Reference Design (Rev. A)".

    In TXBF mode, because the virtual Rx antenna effect by the Tx Antenna disappears, the signals can only be detected by 16 actual Rx antennas.

    It would be appreciated if you could let me know how 1.4 degrees angle resolution (with multiple beam steering) was calculated through Rx beamforming without a separate phase shifter for Rx in TXBF mode.(Please refer to the above question)

  • 0 in reply to Youngjoon So
    TI__Guru*** 140784 points

    Thank you

    I understand your question now. Let me check with the team who wrote this document and get back to you

    Cesar

  • 0 in reply to Cesar
    TI__Guru*** 140784 points

    Hi,

    Sorry for the late reply

    This azimuth resolution can be achieved in TXBF by stitching multiple beams together. The steering step size should be less than resolution, such as 0.2 degree. For example, if two corner reflector at 0 and 1.8 degrees separately, you can scan [-5:0.2:5] and then stich these scan together. You will be able to separate the corner reflectors after stitching.

    Thank you

    Cesar

     

  • 0 in reply to Cesar
    Prodigy 95 points

    Thanks for checking out my question.

    Just one more question.

    If so, for example, if the Tx signal is steered in 0.2 degrees step, can the Rx resolution be up to 0.2 degrees?

  • 0 in reply to Youngjoon So
    TI__Guru*** 140784 points

    Hi

    Let me check with the systems team and get back to you

    Thank you

    Cesar

  • 0 in reply to Cesar
    TI__Guru*** 140784 points

    Hi

    Sorry for the delay,

    For your question:

    "If so, for example, if the Tx signal is steered in 0.2 degrees step, can the Rx resolution be up to 0.2 degrees?"

    The answer is no,

    It is not possible to achieve 0.2 degree resolution here. Resolution is limited by antenna aperture size. The resolution is the same as MIMO. The step size will affect the angle accuracy. Step size depends on how accurate the angle estimation is needed. Typically it is less than resolution

    Thank you

    Cesar

  • 0 in reply to Cesar
    Prodigy 95 points

    Thanks for your help