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originalfoo / SensorArray

Open source sensor array
MIT License
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Lightning triangulation #7

Open originalfoo opened 7 years ago

originalfoo commented 7 years ago

The lightning sensor determines approximate range, but not direction.

To determine direction, triangulation will likely be required with the aid of additional lightning sensors. This will require two or more sensors to be within calculable on-scale range of a lightning strike and also track the time of the strike to a sufficient degree of accuracy (as there can be multiple strikes within the space of a minute).

The speed at which EM interference (used by the sensor to detect lightning) travels through air will be affected by things such as atmospheric moisture, temperature, terrain, etc., with will add further complexity to the calculations.

originalfoo commented 7 years ago

It is essential for a TOA lightning locating network that all participating stations behave exactly the in the same way. Otherwise the computing accuracy will drop!

hmmm.

originalfoo commented 7 years ago

source p90:

Why do we need a GPS?

The main reason why we use a GPS module is the time measuring. The TOA (time of arrival) lightning location method is based on a high precision time measuring of the lightning discharge with an accuracy of less than ±1 µs. A time difference of ±1 µs corresponds to an distance difference of ± 300 m. Such a high precision time measurement is only possible with a GPS module that outputs a 1PPS (1 pulse per second) signal. Other techniques like using the DCF77 signal are not adequate for such a high precision time measurement. The additional output of the exact geographic position of the site is a pleasant side effect of GPS devices.

originalfoo commented 7 years ago

See also: #17