[Lf] [Discuss-gnuradio] VLF Application

[Maitland Bottoms]

Here are some excerpts from a message I came across which may be of
interest to those on this list...

Joseph DiVerdi <diverdi at xtrsystems.com> writes to discuss-gnuradio:
 > I've been working on a VLF Software Receiver for use in
 > investigating certain ionospheric phenomena. These investigations
 > involve measuring the *complex* amplitude of several terrestrial VLF
 > transmitters which has been forward scattered off of the
 > ionosphere. The complex amplitude is sensitive to the elevation of the
 > reflecting/refracting layer which in turn is sensitive to solar wind,
 > CMEs (Coronal Mass Ejections), and supposedly to  GRBs (Gamma Ray
 > Bursts). 

 > The primary goal of this work is to set up a multi-channel, VLF
 > observatory operating in the range 10-100 kHz using software radio
 > and digital signal processing techniques which can monitor several
 > frequencies simultaneously, measure the complex amplitude of each
 > received frequency, and report these results on-line and real-time
 > using popular Web-based technologies.

... Many details ommitted here. See the full original message at
    http://mail.gnu.org/archive/html/discuss-gnuradio/2003-01/msg00027.html

 > 
 > I am currently searching for a used PCI-based ADC input board with
 > at least one (single-ended or differential) input with at least 12
 > bit resolution and 200 (preferable 250) kSample/second sampling
 > rate.

...

 > That's the summary of work to date. I hope to be "on-the-air" by
 > the beginning of summer 2003 with a detailed web site describing
 > the instrumentation, software, graphical data and text data. It is
 > expected to mimic my current terrestrial magnetism observatory at
 > http://xtrsystems.com/magnetometer.
 > 
 > Best regards,
 > Joseph
 > -- 
 > Joseph A. DiVerdi, Ph.D., M.B.A.          
 > http://diverditech.com/           970.980.5868 (voice) 
 > http://xtrsystems.com/            970.224.3723 (fax)
 > PGP Key ID: 0xD50A9E33