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Original question:

AWR1843BOOST: How to understand Beam Steering Example GUI output

AWR1843BOOST: How to change desired steering angle in lab0011 Beam Steering project

Mostafa Besar
Intellectual 470 points
Part Number: AWR1843BOOST
Other Parts Discussed in Thread: AWR1843

Hello,

In Beamsteering for Corner Radar Reference Design

I am confused about the step size which is 30 degree in figure 1 and step size which is 20 degree in figure 2. 

Q1. What's the difference between these step sizes?

Q2. How to set the step size and the steering angle between -+60 to -+80 just as an example in the firmware?

 

Figure1

Figure2

Thanks,

Mostafa

  • +1
    TI__Guru*** 149044 points

    Hi, the step size is configurable. So it can be 20 deg as well as 30 deg.

    Please see Slide 21 in this document for information on how to change the step size.

    labs\lab0011_mrr_beamsteering\docs\mrr_2_0_Developer_Guide.pdf

    Notice that the FOV of the antenna will be a limitation even if you set the min/max Angle to +/-80deg.

    Please check the EVM UG for information about the performance of the antenna at +/-80deg

    thank you

    cesar

  • 0 in reply to Cesar
    Intellectual 470 points

    Hello Cesar,

    - Thanks for reply. I have another question, what's the Azimuth angle of lab0007 MRR project? I don't think it's the same of lab0011 MRR Beamsteering project.

    Thank,

  • 0 in reply to Mostafa Besar
    TI__Guru*** 149044 points

    The MRR project there is no beamsteering applied. So, the beams are focused at angle 0

    Thank you

    Cesar

  • 0 in reply to Cesar
    Intellectual 470 points

    Hello Cesar, 

    Yes I know, but I want to know angle of FOV in lab0007 MRR project?

    Thanks,

    Mostafa

    Cesar said:
    The MRR project there is no beamsteering applied
  • +1 in reply to Mostafa Besar
    TI__Guru*** 149044 points

    HI,

    The FOV is not determined by a specific demo. It is defined by the antennae.

    The AWR1843BOOST User Guide provides this information.

    Please see

    Figure 11 and Figure 12

    https://www.ti.com/lit/ug/spruim4b/spruim4b.pdf

    For MRR since we are only using azimuth, you would only be interested in Figure 11

    Thank you

    Cesar

  • 0 in reply to Cesar
    Intellectual 470 points

    Hello Cesar,

    Q1. As mentioned antenna gain patterns determines the azimuth theta, Where I can find Antenna Gain in lab0007 MRR firmware?

    Q2. It's mentioned in Short Range Radar Reference Design Using AWR1642 that Antenna Field of View ±60º With Angular Resolution of Approximately 15º!

    Is FOV of short range projects apply also on AWR1843 lab0007 MRR projects?

    if yes, Beam Steering also it's FOV is ±60º with step size 20 as mentioned, So the FOV of MMR and Beam Steering is the same but the difference is Beam Steering only steer the beam between ±60º?

    Thanks

    Mostafa

  • +1 in reply to Mostafa Besar
    TI__Guru*** 149044 points

    HI,

    1) Antenna gain pattern is a property of the antenna and is usually measured as a decrease in performance compared to boresight performance

    Figure 11, shows the antenna gain pattern simulation data. In this Figure 11, the max at boresight is around 10dB. This value is not important. What is important is that at about 50deg, the gain is 5-7dB lower (for the red curve). The FOV is defined always by a dB threshold. In our documentation we usually use 9dB threshold to define the FOV.

    2) Yes, this information also applies to MRR because the antenna is very similar. The 1843BOOST antenna is identical to 1642BOOST antenna in azimuth.

    Yes, this is correct the FOV is the same for MRR and Beamsteering. The advantage of the Beamsteering is that the SNR is higher.

    thank you

    Cesar