[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

From: Steve Gough
Subject: Re: [Discuss-gnuradio] Doppler shift on waterfall plot with audio signal
Date: Fri, 21 Oct 2016 17:16:54 -0400

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?

Attachment: attachment1.png
Description: PNG image

reply via email to

[Prev in Thread] Current Thread [Next in Thread]