[TangerineSDR] VLF-RX tools

Robert McGwier rwmcgwier at gmail.com
Mon Mar 22 20:57:23 EDT 2021


Is there a location for documentation that tells details on the processing
methodology in the tools?


Dr. Robert W McGwier, Ph.D.
Adjunct Faculty, Virginia Tech
ARDC Member of Board

On Wed, Mar 10, 2021, 9:59 PM Jonathan via TangerineSDR <
tangerinesdr at lists.tapr.org> wrote:

> Hi Tom,
> Thank you for looking at the documentation for vlfrx-tools! I'll list some
> useful utilities included in vlfrx-tools to try to illustrate how useful
> they can be. A utility can be written to convert to DigitalRF/HDF5,
> however, vlfrx-tools does not normally generate IQ data.
> For others on the list, the vlfrx-tools documentation is
> available at http://abelian.org/vlfrx-tools/ and this also includes the
> source code. Also, for the others on the list, I'd like to make the
> argument that vlfrx-tools is advantageous because of its useful toolset in
> analysis and post-processing of both natural radio, amateur radio in the
> VLF band, and VLF transmitters. Such tools don't exist (to my knowledge)
> for formats like DigitalRF. Since vlfrx-tools is such a diverse and
> usefull toolset that already exists, it's advantageous to utilize it in
> post-processing on the PSWS database to make available SID events,
> whistler and chorus events, and lightning location data, just to name a
> few.
> vtblank - an impulsive noise blanker that removes sferics and other
> impulsive noise from the VLF spectrum. It's useful in studying VLF
> transmitters and especially useful for VLF QSOs.
> vtam - used to extract the magnitude of a non-stationary signal like a
> sferic. You can examine the timing of sferics, whistlers, and the edges of
> timing signals like WWVB.
> vtpolar - generate a polar plot movie of a triple axis VLF stream. This
> allows you to see the bearing of incoming VLF signals like whistlers.
> Please watch the movie in the documentation!
> vtsid - automatically  detects sudden ionospheric disturbances with VLF
> transmitters like NAA. It generates a plot and a data file. The extraction
> utility can extract records from that data file.
> vtevent - automatically detects whistlers and chorus and generates a
> spectrogram plot, data file, and audio file of the event.
> vttoga - creates time of group arrival data from sferics the incoming VLF
> stream or a file.
> vtspot - used to generate lightning location data from vttoga data from
> VLF receivers around the world. The PSWS database can provide lightning
> location data using a network of receivers.
> vtping - used to detect meteor ping.
> vtwrite - writes a VLF stream, either from a ring buffer or network
> socket, to file for storage.
> vtread - reads a .vt file into a ring buffer or network socket.
> vtraw - extract raw audio froma VLF stream. This also removes the
> timestamping.
> vtwavex - extract a wav file from a VLF stream. This also removes the
> timestamping.
> These are just some examples of useful utilities of vlfrx-tools. A utility
> to convert a .vt file to DigitalRF/HDF5 can be written (however, I cannot
> support that). Also, vlfrx-tools does not generate IQ data normally. But,
> with such a toolset, so much can done. I would hope this convinces some of
> those who may be skeptical. In any case, I urge you to look at the
> documentation.
> Jonathan
> On Wed, 10 Mar 2021, Tom McDermott via TangerineSDR wrote:
> > Date: Wed, 10 Mar 2021 12:07:26 -0800
> > From: Tom McDermott via TangerineSDR <tangerinesdr at lists.tapr.org>
> > To: TAPR TangerineSDR Modular Software Defined Radio
> >     <tangerinesdr at lists.tapr.org>
> > Cc: Tom McDermott <tom.n5eg at gmail.com>
> > Subject: [TangerineSDR] VLF-RX tools
> >
> > Hi,  I don't have Jonathan Rizzo's direct email, so sending this to the
> > list.
> >
> > We talked a bit about the VLF receiver on the last conference call, and
> the
> > VLFRX tools.
> > I'd like to email with Jonathan directly.   It appears those tools have
> the
> > ability to
> > read from a file (and thus in Linux from a named pipe).  Gnuradio can
> write
> > to a named pipe
> > as well to DigitalRF (HDF5).   Perhaps this may provide a mechanism to
> > hook the receiver both to the Tangerine archiving method as well as to
> > VLFRX.?
> >
> > -- Tom, N5EG
> > n5eg at tapr.org
> >
> --
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> TangerineSDR at lists.tapr.org
> http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org
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