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AWR1843AOP: or IWR6843AOP? Which is best for 3D environment detection?

Guglielmo Cassinelli
Prodigy 40 points
Part Number: AWR1843AOP
Other Parts Discussed in Thread: IWR6843AOP, , AWR1843

I know the 60-64 vs 77-81 Ghz difference, but in practice which is the best for close range 3D objects/obstacles detection?

Is the output of the AWR1843AOP more dense than the IWR6843AOP?

I've tested the 6843 and its output is very sparse.

  • 0
    TI__Expert 7510 points

    Hello,

    You will not get a less sparse point cloud from switching to a AWR1843. The biggest consideration when selecting frequency becomes important is related to regulatory bodies specifying particular frequency bands for particular applications. Can you elaborate on what you are trying to do, so that I can assist you further? The nature of the point cloud is something that depends on a lot of factors and needs to be tuned for every scene, so how much tuning have you done and with what demos have you tried?

    Best regards,

    Connor Desmond

  • 0
    TI__Mastermind 39835 points

    There is a slightly different in angle resolution between the two boards.  XWR1843 has a slightly worse elevation angle resolution, since its visual antenna has 3 antenna in elevation direction.  while xwr6843 has 4 antenna element in elevation direction.  However, xwr6843 has a worse angle resolution in 45 degree direction and a better angle resolution in 135 degree direction.   

    But as Connor said, it should not be the reason for the sparse point cloud.  

    Best,

    Zigang

  • 0
    Prodigy 40 points

    Thanks for your replies,

    can you explain what you mean with xwr6843 having worse resolution in 45° and better at 135° ?

    I'm talking about the AOP versions, I think that the new AWR1843AOP has same number of antennas of IWR6843AOP

    I've used the OOB demo and tried all the parameters, also CFAR and Doppler range thresholds. I didn't dig too much in chirp configuration.

    I'm trying to do something similar to 3D mapping, so I usually set best range accuracy. Lowering the thresholds gives more points but also more noise and reflections in, so probably I need to filter those out after, right?

  • 0 in reply to Guglielmo Cassinelli
    TI__Mastermind 39835 points

    HI, 

    You can find the visual antenna for xwr6843AOP (in TDM MIMO mode) at https://dev.ti.com/tirex/explore/node?node=AGMzFzzFdFllMlyaWeXNlw__VLyFKFf__LATEST 

    In the 0 degree, 90 degree, 135 degree direction, there are 4 antenna unit, however, in the 45 degree direction, there are only two antenna unit.   Therefore, the angle resolution on 45 degree is the worst for this antenna design.   You can use the similar way to analyze xwr1843AOP.

    Best,

    Zigang

  • 0 in reply to Guglielmo Cassinelli
    TI__Expert 7510 points

    Hello,

    Below is a snippet from the following webpage:

    https://www.ti.com/sensors/mmwave-radar/industrial/applications/applications.html

    Here you can see that IWR6843AOP the angular resolution is approximately 30 degrees in both azimuth and elevation. This is the main factor is which going to limit for mapping based applications. Since your application is for 3D mapping then this device gives the best angular resolution for both azimuth and elevation combined. Could you please provide an example of the point cloud that you are seeing, so that we could take a look?

    Best regards,

    Connor Desmond