• State TI Thinks Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 1 answer
  • Subscribers 54 subscribers
  • Views 1119 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

Angle of Arrival signal oscilations

BOOSTXL-AOA: Angle of arrival

pradeep sambu
Intellectual 420 points

Part Number: BOOSTXL-AOA

Hello Ti,

I have conducted an angle of arrival experiment in various environments such as indoor-outdoor and all. I have taken all the instructions provided and thank you for that. Now I have a few concerns regarding that.

1) Where should the master be placed(ideally ) when the slave or sender is placed 1m above and 2.8 m far from the sender. 

2) I have conducted experiments and got these values i.e., 40 degrees as the angle even though I have measured manually it to be 0. I have attached an image below please have a look at it 

3) whenever I change the sender the angle changes but it does change as per the angle it should be  It usually gives values from 50 - (-50) instead of -180- (-180). Please let me know how to correct this.

  • 0
    TI__Guru* 83691 points

    Hi Pradeep,

    1. Do you mean during calibration? In this scenario the master and nodes should be placed with a 1 m distance.

    2. Does this always happen?

    3. I don't understand this question, can you please re-phrase?

  • 0 in reply to Marie H
    Intellectual 420 points

    Hello Marie,

    Thank you for your response.

    1) So during calibration i.e, measuring AOA where should the three devices need to be placed? master and passive are connected to the system having the software and the slave or the sender is placed 2.8m from them with 1 meter above the ground surface. I am not sure about the placement youre talking about could you explain or give a sketch about the positioning of the devices?

    2) this is happening always when I place them at a 0-degree angle I have never got the AOA value as 0. (I have measured manually the angle between the antenna array and the slave or the sender which is 0).

    3) I am saying that whenever I am moving the slave the angle changes are not reflected in the rtls ui graph. So, whenever I change should I disable and enable the AOA?

  • 0 in reply to pradeep sambu
    TI__Guru** 101490 points

    Hi,

    No calibration is required for AOA. How many antennas-arrays are you using? What do you consider as 0 degree angle? Is it the top of the triangle?

    Please provide a picture of your setup.

    Regards,

  • 0 in reply to Clément
    Intellectual 420 points

    I am using 2 launch pads one is for the slave and other for master and one Launchpad and boost xl for the passive. Yes, I am taking the top of the triangle as the reference,

    My question is where should the three devices master, passive and slave are to be placed for better results.

  • 0 in reply to pradeep sambu
    TI__Guru** 101490 points

    Hi,

    A few remarks:

    - If you did not modify the OOB demo, the 0 angle is perpendicular to the antenna array A1.

    - Placing the slave at +/- 90 degrees is not recommended (you are at the limit of the area covered by the antenna array)

    - The closer the devices are, the fewer multipath will occur, the better will be your results

    Regards,

  • 0 in reply to Clément
    Intellectual 420 points

    Where is the OOB demo? Is there any demo on how to perform AOA? So When the AOA is kept perpendicular it should result in 0 degree angle right? I have placed both the transmitter and sender on two stools abouve 1m and separated 3m from it. Is it ideal or shall I place them over a table?

  • 0 in reply to pradeep sambu
    TI__Guru** 101490 points

    Hi,

    OOB means "Out Of the Box" and refers to the code provided in the SDK with no modification.

    We have a demo to show case the AOA possibilities of the device but not a demo showing how to do the demo. If needed, you can have a look to the Simple Link Academy trainings and to the AOA welcome page.

    Yes, maybe. Actually, it dos not matter, the position of the zero will be easily configurable in your final product (it is only an offset at the end of the day).

    If the two stools are not in metal and are not creating interference or multipath then it should be ok. The "ideal" environment is an environment without RF perturbation and without multipath possibilities.

    I hope this will help,

    Kind regards,