Re: [Discuss-gnuradio] Doppler shift on waterfall plot with audio signal

[Chris Kuethe]

I've been meaning to do some more experimentation here using CW, FMCW,
and chirps.

You should be seeing a bright line down the middle of the waterfall.
If not, your hardware isn't working - I'm thinking it's your speakers
since you do seem to be gettting *something* from the microphone on
your FFT. You won't hear the tones since they're ultrasonic, but is
your sound muted?

On Fri, Oct 21, 2016 at 10:01 AM, Steve Gough <address@hidden> wrote:
> Hi All,
>
> I am interested in analyzing the doppler shift of a transmitted signal.
>
> As a first step, I want to see if I can capture hand movements in a
> Waterfall sink for an audio signal (tone). For that I use a flow graph like
> the attached screenshot based on
> https://github.com/ckuethe/gnuradio-examples/tree/master/doppler_sonar and
> https://www.youtube.com/watch?v=9trGfdcMPtk&noredirect=1.
>
> I don't observe any doppler shift when I move my hand/walk in the vicinity.
> I can see the FFT plots change in shape on motion, but nothing is observed
> on the Waterfall sink.
>
> Could you please tell me if I am missing something here?
>
> The observed waterfall spectrogram is also attached.
>
> Thanks,
> Steve
>
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-- 
GDB has a 'break' feature; why doesn't it have 'fix' too?

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