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CC2640R2F: Requirements in Triangulation

Akansha Verma
Expert 1220 points
Part Number: CC2640R2F


Hi,

How many passive and master boards are required to localize a slave ?

Is there any document available, which can help in triangulate a slave device?

How to utilize angles produced by IQ samples of a packet to obtain AOA of that packet?

Thanks and Regards

 Akansha

  • 0 in reply to Eirik V
    Expert 1220 points

    Hi,

    I have performed this AOA lab.

    Now i wants to know how to get the AOA from those many angles from IQ samples and how to utilize that angle to localize that slave.

    Thanks

    Akansha

  • 0 in reply to Akansha Verma
    TI__Guru** 101460 points

    Hi again,

    1- Triangulation requires two observers for 2D positioning

    2- There are a lot of papers providing information and algorithms available on the web.

    3- We have already discussed the way to calculate the AOA using the raw IQ data. You can also let the RTLS devices do the computation themselves using the mode AOA_MODE_ANGLE as it is done in the python script named rtls_example_with_rtls_util.py

    I hope this will help,

  • 0 in reply to Clément
    Expert 1220 points

    Hello Clement,

    Thanks for early reply.

    As i am getting angle value with respect to some IQ samples of a packet, and my question is that how to calculate AOA for a packet. Because i am getting many values of angles for a packet depending on IQ samples.

    and how to solve the problem of not getting IQ samples sometimes?

    By the set of two observers you mean (2 set of master+passive)?

    Thanks

    Akansha

  • 0 in reply to Akansha Verma
    TI__Guru** 101460 points

    Hi Akansha,

    The AOA of a packet is obtained using the IQ samples issued from two different antennas. If you take only one IQ sample then yo cannot compute anything. I let you have a second look at the Simple Link Academy lab for the details. By reviewing your other thread I noticed you were already doing this (i.e. using one IQ sample to try to get the AOA). Sorry for not noticing before.

    When I wrote you need two observers, I meant two passives. In fact you still need only one master-slave connection, but you need several (two) devices to measure the AOA.

    To finish, regarding the issue you are having with sone IQ samples missing, I told you I need some time to dig into it. What we should do (because it will be easier for both of us and clearer for the other readers) it's open a new thread only dedicated to this problem and close the other threads (when resolved of course). Is it ok for you? Can you open the thread dedicated to the topic "not getting IQ samples sometimes"? (please enclose all the details / tests / remarks you have even if you have already written them somewhere else)

    Thanks and regards,