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Original question:

AWR6843: Question about AOA and AOA2D DPU

AWR6843: AoA Estimation with angleFFT

Ferran Coll Bernabé
Prodigy 30 points
Part Number: AWR6843
Other Parts Discussed in Thread: IWR6843AOP

Tool/software:

Hi everyone,

I am working with IWR6843AOP, from which I have extracted raw data using the DCA1000. I have post processed it and reached range and doppler information by performing FFTs, but now I have questions and issues related with angle of arrival computation. I have found a question that has not been aswered yet that I find interesting regarding 2D FFTs or 2 isolated 1DFFT for AoA: https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/1295468/awr6843-question-about-aoa-and-aoa2d-dpu.

On the other hand, I see the following image of the Virtual Antennas which si pretty similar to the one I have, but then it turns out to have 64 azimuth bins after the angleFFT computation. How is it even possible? I thought that the angle resolution was directly set by the 2/N rule, so having 64 angle bins totally exceeds it.

 

To sum up, I want to build an azimuth elevation heatmap from the raw ADC data extracted, but I am having issues regarding the angleFFT. Has anyone been in involved in something similar that can ease my work?

Thank you very much

  • 0
    TI__Mastermind 40205 points

    Hi, there:

    For 2D angle FFT, you can go through the following documentation for details.

    file:///C:/ti/mmwave_sdk_03_06_00_00-LTS/packages/ti/datapath/dpc/dpu/aoa2dproc/docs/doxygen/html/index.html

    You can zero filling at the end, and do higher point FFT. 

    Best,

    Zigang