[TangerineSDR] [HamSCI] Indian Lightning Detection Network Launched

[Jonathan]

Hi Willie,

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.

Hi John,

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.

Jonathan
KC3EEY

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
>> <https://ildn.in/imap.php>.
>>
>> 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
>> solutions.
>>
>> 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.
>>
>> Jonathan
>> KC3EEY
>>
>>
>>
>>
>>
>>
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