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Original question:

AWR1642: Algorithm of TIDEP-0092 reference design and SDK library

AWR1642: Algorithm of TIDEP-0092 reference design and SDK library

Henry Lin
Prodigy 220 points
Part Number: AWR1642
Other Parts Discussed in Thread: TIDEP-0092

Hi,

I still have question about cfar parameters in reference design TIDEP-0092, I do have ideal how to calculate the threshold with const1 and const2, Could you give me an example about calculating detection threshold of  CUT in SRR case.

Another question, can you describe more detail about association clustering process ?

Thanks, your answer will be very helpful to me !!

Best regards,

Henry Lin

  • 0
    TI__Guru*** 149044 points
    Hi,

    Please make sure that you have reviewed SRR related threads in this forum.

    Thank you
    Cesar
  • 0 in reply to Cesar
    Prodigy 220 points

    Hi,

      I have reviewed related threads but still have question about cfar calculating formula in SRR design,what is the relation of const1 、const2、virtual antenna、scale factor...etc.

    Thanks!

    Best regards,

    Henry Lin

  • 0 in reply to Henry Lin
    TI__Expert 4720 points

    Hi Henry,

    The descriptions of the const1, const2, etc are given in the code (as well as in the SDK userguide) in the CFAR function implementation.  

    For e.g, if you were to search for const1 in the SRR demo, you'd reach the following line.

    * @param[in]               const1,const2 : used to compare the Cell Under Test (CUT) to the sum of the noise cells:

    *                                          [noise sum /(2^(const2-1))]+const1 for one sided comparison

    *                                          (at the begining and end of the input vector).

    *                                          [noise sum /(2^(const2))]+const1 for two sided comparison

    What this means is that a CUT is considered detected if it is greater than  (noise sum /(2^(const2))]+const1).

    For a CFAR-CA implementation where the window size is 16, const2 can be set to 4, so that noise_sum is converted to a noise average. Const1 is then simply threshold factor. 

    As far as the concept of 'virtual antenna' is considered, please go through the training material (). It explains the different terminologies that are used within the TI mmwave implementation. 

     

    Regards

    Anil