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Re: [Discuss-gnuradio] Handling of IQ files

From: Vitt Benv
Subject: Re: [Discuss-gnuradio] Handling of IQ files
Date: Sun, 20 Mar 2016 21:16:33 +0100

this [ https://sourceforge.net/projects/automodrecog/ ] is my little
effort about handling IQ files.
The input IQ file is recorded with HDSDR, very nice piece of sw, that
as a good recording scheduler. By the way the file provided can be
played with it. I do also some tests with IQ file produced by R&S
EM100 receiver.
I wrote this [horrible] application for personal use and it's very raw IMO....
I'm interested on HF monitoring and the main goal is to find SSB
emission along time, not quite simple task.

In brief:
- read params from input file
- split it in smaller chunk and save FFT for each chunk
- sum (maxhold) or avg (average) all the FFTs
- find relevant ( over threshold) carrier and try to "pack" them to
find "bandwidth" associated
- build a report as .html page with a .png file that represent the result.

The most difficult part is to estimate the best "threshold", and at
the moment I'm almost stuck there.... and moreover RL reclaims my
presence :-)

... my euro "cent" on the subject.

Victor I3VFJ

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