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IWR6843ISK: what is the elevation resolution ?

Shai Berman
Mastermind 7400 points
Part Number: IWR6843ISK

Hi team,

According to TI’s website, the IWR6843ISK has 108° azimuth field of view (FoV) and 44° elevation FoV when you use 3Tx and 4R,

but the resolution is not mentioned, could you please advise what is the azimuth and elevation angular resolution?

Thanks in advance 

Best regards,

Shai

  • 0
    TI__Guru 50240 points
    Hi Shai,

    Thank you for your question. I'll need to talk to an antenna expert in order to provide an answer for you, please allow a few days for a response.


    Cheers,
    Akash
  • 0 in reply to Akash Gondalia
    TI__Mastermind 25825 points
    Shai,

    We have kept 4 Rx and two Tx antennas Azimuth order with Lambda/2 spacing for Rx and 2 x Lamda spacing for Txs, which forms 8 elements virtual array in Azimuth and 2 elements in elevation direction. This gives 15 degree angle resolution in azimuth, and 58 degree of angle resolution in elevation.

    Thanks and regards,
    CHETHAN KUMR Y.B.
  • 0 in reply to CHETHAN KUMAR Y.B.
    Mastermind 7400 points
    CHETHAN,

    Thank you for your input but how is it possible to have a resolution of 58[deg] while the FOV is only ~44[deg]?

    Best regards,
    Shai
  • 0 in reply to Shai Berman
    Mastermind 7400 points

    Team Hello,

    what's the meaning of having elevation resoiltion of 58[deg] while if we have FOV of 44?

    Could you please advise, thanks.

    Regards,

    Shai

  • 0 in reply to Shai Berman
    TI__Mastermind 25825 points

    Angular resolution – This is defined as the minimum angular difference over which the detector can distinguish two individual point targets that also happened to have the same range and velocity. This is determined by the number and geometry of the antennas in the transmit and receive antenna arrays. This is typically specified separately for the azimuth and elevation. 

    Angle resolution depends on below equation:

    Where N is number of Antennas (Either in Azimuth or in Elevation plane) and d is the distance between the Antennas. 

    To get best possible Angle estimation range d need to be lambda/2 (and this is what we use in our EVMs). And this equation is independent of Antenna Radiation pattern/FOV.

     

    And  for the 6843ISK EVM in elevation direction only 2 antennas are available. That results in angle resolution of 1 radian. Which is 57 Deg.  

    What this mean is, if there are more than 1 object in the same Range/Velocity bins and if we need to separate them as two distinct objects, then objects must be separated beyond 57 deg.

    For more details please refer to MIMO Radar app-note. 

    http://www.ti.com.cn/cn/lit/an/swra554a/swra554a.pdf

    Thanks and regards,

    CHETHAN KUMAR Y.B.

  • 0 in reply to CHETHAN KUMAR Y.B.
    Mastermind 7400 points
    Dear Chethan,

    Thank you very much for your detailed answer.

    Best regards,
    Shai