On 03/19/2016 02:05 PM, Henry Barton wrote:
So there’s no “read x samples, divide by y, do such-and-such, and you
have a frequency-domain array” that I can average over time?
Sent from Windows Mail
Gnu Radio has various types of FFT blocks, filters, decimators, etc,
etc. But there is no big, blue 'Do that thing that Henry Barton wants
to do'
button. It's a development framework for developing DSP
applications, largely in the radio space. One could *use* Gnu Radio to
*build* a "signal analysis workbench", but Gnu Radio isn't in and of
itself, "a signal analysis workbench".
Just as GCC isn't "that cool spreadsheet app I'd love to have", but it
can certainly be *used* to *build* "that cool spreadsheet app I'd love
to have".
*From:* Nikos Balkanas <mailto:[email protected]>
*Sent:* Saturday, March 19, 2016 1:31 PM
*To:* James Humphries <mailto:[email protected]>
*Cc:* Henry Barton <mailto:[email protected]>,
[email protected] <mailto:[email protected]>
Hi,
I missed your second part. gr-fosphor is realtime, so It will follow
whatever frequencies you have. Frequency hops show as frequency bands
in a frequency spectrum.
The frequency spread of a single plot, is your sampling frequency.
HTH,
Nikos
On Sat, Mar 19, 2016 at 7:22 PM, James Humphries
<[email protected] <mailto:[email protected]>> wrote:
Hi Henry,
There is a script, read_complex_binary.m, that is included with
gnuradio. You can use that with Octave or Matlab to read the I/Q
recordings from a file as a time vector.
-Trip
On Sat, Mar 19, 2016 at 12:43 PM, Henry Barton <[email protected]
<mailto:[email protected]>> wrote:
Is there any simple formula for plotting spectrum (finding the
intensity of each frequency component, Hertz by Hertz) from IQ
recordings? Specifically I need to know how to read an IQ file
and somehow dissect clusters of samples. I’ve written programs
that deal with large amounts of data from files, so I think
this shouldn't be too hard. I want to write my program so that
it takes in a multi-hour IQ file and averages it like the
24-hour band averaging on the University of Twente WebSDR
site. This would allow users to average an IQ file over time
and see the most active frequencies and times. There’s no
utility for this yet, and I’d like to write it and release it
on my blog.
On a side note: is it possible to go “frame-by-frame” in an IQ
file? For example, to follow the hops of a 900-MHz FHSS device.
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