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Re: [Discuss-gnuradio] Handling of IQ files


From: James Humphries
Subject: Re: [Discuss-gnuradio] Handling of IQ files
Date: Sat, 19 Mar 2016 13:22:45 -0400

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 <address@hidden> 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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