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Questions on angle estimation resolution and acurracy.

Yang Tianxi
Intellectual 525 points

TI used 3D-FFT(Angle-FFT) to estimate target's DOA, as we known, there are other DOA algorithms,such as MUSIC,ESPRIT,Maximum likelihood, etc., Naturally there are  questions here,

1)   Why TI chose method of 3D FFT?

2)   Which DOA algorithm mentioned above is best when using TI platform? 

P.S., From my experience of 24G automotive radar development,  MUSIC is good algorithm,although it involves a lot of computation.

  • 0
    TI__Expert 4720 points
    Hi Tianxi,

    1) TI chose zero-padded 3D-FFT because it was simple and robust. Also, there is a very fast implementation of the FFT algorithm in the c674x DSP library.

    2) The problem with the 3D-FFT approach is that closely spaced targets cannot be easily distinguished and other algorithms like MUSIC, and ESPIRIT are better. The problem with algorithms like MUSIC, and ESPIRIT is that unless the number of targets in a range-velocity bin can be correctly estimated, the angle estimates are likely to be very wrong. Also, we do not have a library implementation of MUSIC, or ESPIRIT, and you would have to write one yourself.

    Regards,
    Anil