Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Next revision
Previous revision
en:about [2016/06/19 15:43]
tobi created
en:about [2018/11/09 02:27] (current)
rbeerster [Introduction]
Line 1: Line 1:
-====== About Blitzortung.org ​======+====== About ======
  
-Description ​of the project ​etc+This Wiki will continually change due to further developments and improvements. Please edit it yourself. 
 + 
 +Blitzortung.org is a world-wide non-commercial low-cost community-based Time-of-Arrival 
 +lightning detection and lightning location network. 
 + 
 +<note important>​The system is made for private and entertainment 
 +purposes. The domain Blitzortung.org is not an official information service for lightning 
 +data. A commercial use of data from Blitzortung.org is strongly prohibited, even by the users 
 +that send data to our servers.</​note>​ 
 + 
 +This Wiki can change without further notice. Publishing this Wiki or excerpts of it on websites not under our control is unwanted. 
 +===== Introduction ===== 
 +original source(([[http://​en.blitzortung.org/​Compendium/​Documentations/​Documentation_2014-05-11_Red_PCB_10.4_PCB_12.3_PCB_13.1_PCB_14.1.pdf|Documentation System RED]], chapter 1)) (([[https://​docs.google.com/​document/​d/​1KzPZJW0ErInFtfTCmhNhSZTOpg6N2bgZDyIxkh_DRVs/​pub?​1532944531#​h.iubpod4vxyrx|Documentation System BLUE]], chapter 1)) 
 + 
 +The aim of this project ​is to accomplish a low budget high accurate world-wide lightning location 
 +network based on a high number of receiver sites spaced close to each other, typically separated by 
 +50 km - 250 km. The stations transmit their data to a central computing server, where the strike locations are 
 +computed by the arrival times of the signals. 
 + 
 +The station operators are volunteers who bought and assembled the hardware by themselves. 
 +There are also volunteer programmers who develop and/or implement algorithms for the location 
 +or visualization of sferic positions, and people who assist anyway to keep the system running. There 
 +is no restriction on membership. There is no fee and no contract. If a receiver site stops pooling its 
 +data for a longer time period, the server stops providing the access to the archive of sferic positions 
 +for the corresponding user. 
 + 
 +Blitzortung.org is completely different to other data collection platforms as for example marinetraffic.com 
 +or flightradar24.com. Ships and airplanes already know their exact position. They send their positions by radio. 
 +The information can be received with simple receivers and transferred over the Internet to a data server. 
 +Receiving and sending the received position is not time-critical. On the data server nothing needs to be calculated. 
 +The data is only collected and visualized. To receive the position of a ship or aircraft, one receiving station 
 +is sufficient. 
 + 
 +Lightning location, on the other hand, is much more complicated. The waveforms of the signals must be sampled 
 +with high frequency (512 values with at least 500 KHz) and assigned with an accurate absolute time stamp (+/- 1 usec). 
 +The exact location of the detector is extremely important. An absolute microsecond accurate time stamp and an 
 +accurate position of the receiving detector can only be obtained by a GPS module. On the computing server the 
 +signals from different detectors are adjusted and compared each other. Each pair of signals from different 
 +detectors defines a hyperbolic curve. The intersection point of several hyperbolic curves determines the location. 
 +This is calculated on our server in a few seconds, what even professional systems do not always achieve. 
 + 
 +The sferic positions are free accessible in raw format to those participants whose stations transmit 
 +their data to our server. The station owner can use the raw data for all non-commercial purposes. 
 +The lightning activity is additionally displayed on several public maps like Blitzortung.org or LightningMaps.org. Most of the maps can be used for non-commercial purposes. 
 + 
 +This wiki gives an overview about the physical and technical background of our lightning 
 +detection and locating technology. It is also an assembling and operation manual for participants.