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

[Steve Gough]

Thanks for getting back.

There seems to be an issue with WX Waterfall SInk. The WX waterfall sink gives all blue as before, while the QT GUI Waterfall Sink gives a figure like attached. (attachment1.png) .

I also don't see a sharp peak at 0 like your attachment. Could this be a hardware issue ?

Nothing is muted.

 

 

On Fri, Oct 21, 2016 at 4:28 PM, Chris Kuethe <address@hidden> wrote:

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
>

> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>



--
GDB has a 'break' feature; why doesn't it have 'fix' too?

attachment1.png
Description: PNG image