Re: [Discuss-gnuradio] Bins smaller than pixels. was: WX GUI FFT Sink Performance

[Mark McCarron]

I think the best approach is just to include every possible method in GNURadio.  This can only make the platform more versatile.  I make use of overlapping a lot because computation times are a pain.  The trade-off in resolution is acceptable to me because it has limits that I can work around.  This allows me to work with weak signals that would otherwise go unnoticed without some heavy computation.  I typically work at resolutions of over 1 million to examine narrow-band signals.

The other method is to have a system setup to record the spectrum to a file, then allow another computer to do the FFT at different resolutions.  SETI do the same thing with the BOINC platform, only on a far greater scale.

Regards,

Mark McCarron

> Date: Tue, 28 May 2013 13:36:19 -0400
> From: address@hidden
> To: address@hidden
> Subject: Re: [Discuss-gnuradio] Bins smaller than pixels. was: WX GUI FFT Sink Performance
>
> On 5/28/2013 1:28 PM, Simon IJskes wrote:
> > On 17-05-13 02:22, Marcus D. Leech wrote:
> >>
> >> Again, given the fact that your display geometry is likely less than
> >> 1280 wide, you'll simply lose information for FFTs larger than that.
> >
> > I one is looking for weak CW signals, in a waterfall, wouldn't a wide
> > bin, make this signal invisible in among the noise? If more bins fit in
> > one pixel, there could be a mode where the bin with the most power is
> > displayed. If this is complete non-sense, how would you implement
> > looking for faint cw carriers, in like EME applications?
>
> Take a look at the "rosenfell" or "normal" detector used in spectrum
> analyzers -- I think it's a way to deal with this question. There's a
> good discussion in the Agilent spectrum analysis basics app note:
> http://cp.literature.agilent.com/litweb/pdf/5952-0292.pdf
>
> John
>
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