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Original question:

AWR1243: TIDEP-01012: MMWCAS-RV-EVM & MMWCAS-DSP-EVM (ordering)

AWR1243: TIDEP-01012: MMWCAS-RV-EVM & MMWCAS-DSP-EVM (ordering)

Andreas Baumann
Intellectual 470 points
Part Number: AWR1243
Other Parts Discussed in Thread: TIDEP-01012, MMWCAS-RF-EVM

Hello everyone,

I have a question regarding the field of view of the TIDEP-01012. In the design guide it is mentioned that it has a FOV of +/-70° with an (azimuth) angular resolution of approximate 1.4°. I also read that the elevation angle can have a resolution of 18° (MIMO). However, nowhere is mentioned what the actual FOV in elevation is.

Does anyone know where in the specification I can find this information or performed some investigations and can share with me the outcome?

Thank you very much.

Best,

Andreas

  • 0
    Intellectual 470 points

    Two additional question:

    1. What is the minimum range which the sensor can still measure?
    2. is the "frame length" (4.4ms) mentioned in the design guide equal to the acquisition time of one dataset?

  • 0 in reply to Andreas Baumann
    TI__Mastermind 18500 points

    Hi Andreas, 

    1. Minimum range is determined by many factors: 

    • high-pass cutoff frequency attenuation of DC-side IF spectrum 
    • close-in reflection of radome or enclosure resulting in higher DC-side return return and phase noise increase of DC-side of IF spectrum which may masking lower frequency returns 
    • near-field vs. far-field effects of antenna radiation pattern
    • bi-static vs. mono-static TX/RX antenna distance vs. range of target

    2. Frame length 

    • Frame length quoted in "Table 2. Chirp Configuration - MIMO "is the entire TDMA-MIMO frame time. This includes 12 different single-TX on frames. 
    • Yes, this would be a single TDMA-MIMO dataset

    Thank you,

    -Randy

  • 0 in reply to Randy Rosales
    Intellectual 470 points

    Thank you very much Randy,

    that is very helpful! Do you may also know the answer my first question (vertical field of view)?

    Best regards,

    Andreas

  • 0 in reply to Andreas Baumann
    TI__Mastermind 18500 points

    Hi Andreas, 

    The MMWCAS-RF-EVM User Guide should be referenced for the relevant antenna and antenna array information. http://www.ti.com/lit/ug/swru553/swru553.pdf 

    Please see sections "2.6.2.1 RX Antenna Element Performance" and 2.6.2.2 TX Antenna Element Performance". The antenna patterns used to estimate field of view are shown there. We try to use the 3dB gain beam width as the cutoff point for antenna field of view. 

    We provide a few representative examples of the TX antenna pattern at 76GHz, 78.5GHz and 81GHz and the RX antenna at 76GHz. You can see how the beam shape changes across the full AWRx operation frequency and across the different antenna in the arrays. But generally we stay within the +/-60deg azimuth and +/-18deg elevation quoted in the TI Design app note.

    Thank you,

    -Randy

  • 0 in reply to Randy Rosales
    Intellectual 470 points

    Thank you very much Randy!