[TangerineSDR] [HamSCI] Indian Lightning Detection Network Launched
emuman100 at gmail.com
Tue Jun 21 12:24:54 EDT 2022
Distant strokes originating from the opposite hemisphere won't give
accurate solutions, but stroke solutions will be generated if it occurs
within a polygon traced out by VLF receivers. It uses trilateration. See
the vlfrx-tools documentation <http://abelian.org/vlfrx-tools/notes.html>
section of lightning location.
See vlfrx-tools documentation <http://abelian.org/vlfrx-tools/notes.html>
and a Raspberry Pi guide <http://abelian.org/rpvlf/> to setup
vlfrx-tools on a Pi.
On Tue, Jun 21, 2022 at 10:31 AM W8UM Ann Arbor <palmy at umich.edu> wrote:
> I would like to learn the details. Thanks, John
> On Tue, Jun 21, 2022 at 9:53 AM Jonathan <emuman100 at gmail.com> wrote:
>> Hi All,
>> A new lightning detection network has launched, hosted by the Centre for
>> Lightning and Thunderstorm Studies (CeLTS), Department of Physics, Tripura
>> University, India. The website can be found here
>> The network utilizes six VLF receivers and vlfrx-tools, specifically the
>> vttoga and vtspot utilities.
>> A minimum of five VLF receivers are required for accurate stroke
>> vttoga produces TOGAs (time of group arrival) from timestamped VLF
>> spectrum data and can be configured to detect sferics based on band,
>> amplitude, and scoring based on signal parameters of the sferic.
>> vtspot computes stroke solutions based on TOGA data from multiple
>> receivers. Due to the model it uses, very distant strokes do not have the
>> most accurate solutions, but in the case of this new network, it works
>> quite well.
>> On the website, you can click on the specific stroke and get
>> various information. Here is an example:
>> StrokeID: 13015001 UT: 2022-06-21 11:17:27.475216 Lat/lon: 17.434,88.963
>> site | ut_timestamp | rms | te | imprat | ascore | dist | delay | vf
>> KK | 2022-06-21 11:17:27.477204 | 0.04721 | 5.4 | 98.4 | 0.40 | 574.8 | 0.001988 | 0.9638
>> T2 | 2022-06-21 11:17:27.477751 | 0.02712 | 1.1 | 71.2 | 0.67 | 743.1 | 0.002535 | 0.9771
>> VW | 2022-06-21 11:17:27.47827 | 0.01116 | -3.1 | 98.3 | 0.92 | 901.5 | 0.003054 | 0.9840
>> DG | 2022-06-21 11:17:27.479491 | 0.01633 | -1.9 | 25.2 | 0.89 | 1268.8 | 0.004275 | 0.9893
>> TV | 2022-06-21 11:17:27.480431 | 0.00742 | 1.4 | 78.9 | 0.81 | 1550.2 | 0.005215 | 0.9909
>> AJ | 2022-06-21 11:17:27.481203 | 0.02054 | -2.9 | 30.8 | 0.32 | 1783.0 | 0.005987 | 0.9927
>> (6 rows)
>> You can see the coordinates of the stroke as well as the TOGA, and
>> various parameters of the receiver site's sferic, like RMS amplitude,
>> velocity factor, timestamp, distance, delay, and ascore, a parameter that
>> awards a score to a sferic according to how "sferic-like" it is.
>> Using a network of VLF receivers and Whistler Catcher LEAF modules for
>> the Tangerine SDR, I plan on creating a lightning location network just
>> like this one. The good thing is, you don't need a Whistler Catcher as you
>> can use a soundcard and PC/Raspberry Pi with GPS module right now. There is
>> some setup and technical work involved and you have to be in a rural
>> location, but it is possible to have a VLF receiver contributing to stroke
>> solutions. Let me know if you'd like to contribute.
>> Please follow the HamSCI Community Participation Guidelines at
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> Please follow the HamSCI Community Participation Guidelines at
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