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[Discuss-gnuradio] Gnuradio and Solar Eclipse

From: John Ackermann N8UR
Subject: [Discuss-gnuradio] Gnuradio and Solar Eclipse
Date: Thu, 31 Aug 2017 13:43:28 -0400
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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.


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