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AWR6843ISK: what is indicated at "Range Profile for zero Doppler" in demo visualizer

Takatoshi Tsuji
Expert 1550 points
Part Number: AWR6843ISK

Helo support team,

I would like to confirm what is indicated at "Range Profile for zero Doppler" in demo visualizer.

I suppose it shows range binary data by certain virtual antenna at certain chirp number after range FFT process.  (For instance, it may be range binary data by TX1-RX1 at chirp1 ?)

If my guess is wrong, please kindly explain what is indicated.

Best regards,

Taka

  • 0
    TI__Mastermind 23655 points

    Hello

    Have you had a chance to look at the plots section in the following guide:

    mmWave Demo Visualizer User's guide.

    By default that is the virtual array it picks/

    If you would like to isolate to specific virtual array you may try to keep that virtual array on and toggle off others.

    Thank you,

    Vaibhav

  • 0
    TI__Mastermind 36515 points

    Hi, Taka:

    The "range profile for zero Doppler" is calculated as follows:

    1) Take the zero Doppler output after range FFT and Doppler FFT/ 

    2) Combine the energy cross all antennas.

    Best,

    Zigang

  • 0 in reply to zigang Yang
    Expert 1550 points

    Hello Zigang, Vaibhav,

    Thank you for your message. Let me ask 3 more queries;

    1) Let me clarify meaning of zero doppler ourput. I suppose output of range FFT has both static data and moving data and output of doppler FFT has only moving data. So, I suppose zero doppler output sound like "output of range FFT" minus "moving data calculated by doppler FFT". Am I right ?

    2) I suppose you mean average of output across all atennas. Is it also average across all the subframes every frame ?

    3) I suppose output will be modified to average data within only intended subframe number by setting the subframe index in guimonitor command. Am I right ?  

    visualizer user guide > For the advancedframe,this plot showsthe rangeprofilefor the firstsubframe,whichhas this plot enabledin the guiMonitorcommand(the plot title reflectsthis subframenumber).

    sdk user guide > For legacy mode, that field should be set to -1 whereas for advanced frame mode, it should be set to either the intended subframe number or -1 to apply same config to all subframes.

    Best regards,

    Taka

  • 0 in reply to Takatoshi Tsuji
    TI__Mastermind 36515 points

    Hi, Taka:

    1) Let us represent Doppler FFT output as DopplerFFTOutput(rangeIdx, dopplerIndx, antIdx), the zero Doppler bin contains the static information, and we also call as zero Doppler output, which is complex value, and can be represent as DopplerFFTOutput(rangeIdx, 0, antIdx).

    2) The power of the zero Doppler (|DopplerFFTOutput(rangeIdx, 0, antIdx)|^2) is sum together across all antennas, to represent signal profile (also called as non-coherent combination among all antennas).   For different subframe, signal profile has to be calculated independently. 

    Regarding which subframe to plot out, you can refer to the visualizer users guide and GUI CLI command. 

    Best,

    Zigang 

  • 0 in reply to zigang Yang
    Expert 1550 points

    Hello Zigang,

    Thank you for your reply.

    Let me make sure output in case of subframe index = -1. In this case, is data sum in all the subframes provided as output to indicate on visualizer ? 

    > For legacy mode, that field should be set to -1 whereas for advanced frame mode, it should be set to either the intended subframe number or -1 to apply same config to all subframes.

    Best regards,

    Taka

  • 0 in reply to Takatoshi Tsuji
    TI__Mastermind 36515 points

    Hi, Taka:

    From the document Vaibhav sent earlier (https://www.ti.com/lit/ug/swru529c/swru529c.pdf?ts=1601484902994, it is mentioned: 

    For the advanced frame, this plot shows the range profile for the first subframe, which has this plot enabled in the guiMonitor command.

    Best,

    Zigang

  • 0 in reply to zigang Yang
    Expert 1550 points

    Hello Zigang,

    Thank you for your clarification. Noted.

    Best regards, Taka