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Original question:

IWR1642: The sensor sometimes lose sight of the detection target for only one frame.

CCS/IWR1642: subframe

user6316336
Prodigy 240 points
Part Number: IWR1642


Tool/software: Code Composer Studio

 I decided to use profile_advanced_subframe.cfg of SDK.
In recordings using the two subframe configuration, I noticed that the target was frequently on and off in successive frames.
Is each subframe output separately, as if it were an individual frame? I thought subframes are added to full frames internally, is that wrong?

Is it possible that the target is too small and is frequently turned on/off in consecutive frames?

  • Former Member
    0 Former Member

    Hello,

    Yes, the online visualizer plots individual subframes separately. The output is NOT aggregated and updated for the entire frame.

    Amanda

  • 0 in reply to Former Member
    Prodigy 240 points

    Hello
    Thank you.
    Is the subframe of log data output individually?
    What are some ways to aggregate the output across frames?

  • Former Member
    0 Former Member in reply to user6316336

    Hello,

    Each subframe has a frame header and associated TLVs so yes each plot you enable is output per subframe. None are aggregated across frames.

    You can either modify the demo to output aggregated data (you can see the long range people detection lab for an example of aggregation of point cloud across two subframes). Or, you can modify the visualizer to aggregate the point clouds in display.

    Amanda

  • 0 in reply to Former Member
    Prodigy 240 points

    Hello.
    Thanks for the answer.

    Shouldn't we simply combine the plots of the two subframes?
    If not, can you please tell me why it's no good?

  • Former Member
    0 Former Member in reply to user6316336

    This is a valid approach and what I meant by my second option and I agree it is the easiest.

  • 0 in reply to Former Member
    Prodigy 240 points

    Hello.
    I'm acquiring data on subframes, but can't I acquire data on each subframe at the same time?

    I'm assuming that the data is acquired every sub-frame between frames as shown in (b) in the attached figure, am I correct in my perception?

    Or do the subframes alternately acquire data frame by frame as shown in the attached figure (a)?

    Also, how can I change the visualizer to aggregate the point clouds that are displayed?

  • Former Member
    0 Former Member in reply to user6316336

    Hello,

    If I understand your figures correctly it is A). So the demo would chirp according to SF1 configuration, output data for SF1, visualizer updates and shows SF1 data. Then emo would chirp according to SF2 configuration, output data for SF2, visualizer updates (overriding old plots) and shows SF2 data. 

    To aggregate the point cloud you'll need to accumulate the point cloud in a variable for SF1 and SF2. Plot the variable then reset the variable for SF1 and then accumulate and repeat.

    You can search the forum for how to modify the GUI in GUI composer if you are familiar with javascript and want to edit the existing visualizer.

    Amanda