As part of the HamSci (http://hamsci.org) solar eclipse experiment I
recorded a bunch of IQ data from HF radio during the eclipse, using
Gnuradio (plus the gr-hpsdr and gr-digital_rf modules) for all signal
processing.
A Red Pitaya running at 2.5 Msamples/sec recorded the entire AM
broadcast band, and an HPSDR Hermes recorded four virtual channels, each
at 384 ksamples/sec, covering the 80M, 40M, 30M, and 20M ham bands. The
data totals just under 1 TB for the 8 hours of recording.
Initial analysis is in the form of time-lapse movies of each band that
compress 8 hours of data (displayed in FFT form) into about 3 minutes.
This provides a quick way to see if anything happened, and a clue where
to zoom in for more detailed analysis.
Rather than making this a long email with lots of boring detail and
links, my blog at http://blog.febo.com has links to the movies on
YouTube, as well as the Gnuradio scripts, background details, etc.
I'm going to be talking about the eclipse experiment, as will Dr.
Nathaniel Frissell (W2NAF), professor at New Jersey Institute of
Technology and head of the HamSCI project, at the upcoming ARRL/TAPR
Digital Communications Conference in St. Louis on Sep. 15-17. Most
Gnuradio types will find lots of interesting content at the conference,
so if you can get to St. Louis, please join us! Details at
http://tapr.org/dcc.
John
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