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
From: Nikos Balkanas
Sent: Saturday, March 19, 2016 1:31 PM
To: James Humphries
Cc: Henry Barton, discuss-gnuradio@gnu.org
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 <james.humphr...@ettus.com>
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 <kw...@outlook.com> 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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