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en:algorithms [2019/04/11 16:56] fluktuaciaen:algorithms [2019/04/11 17:17] (current) – [Existing iPython scripts] fluktuacia
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-====== Methods of data processing used in Bolidozor networkr ======+====== Methods of data processing used in Bolidozor network ======
  
 This site contains several designs of algorithms used for data processing. This site contains several designs of algorithms used for data processing.
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   * Record of available meteorological data for future reconstructions (satellite images, ČHMÚ measurements at a particular time, radar images)   * Record of available meteorological data for future reconstructions (satellite images, ČHMÚ measurements at a particular time, radar images)
   * Data collections from individual stations   * Data collections from individual stations
-  * Calculations of vector and vertical wind profile (?? Výšový profil větru) +  * Calculations of vector and vertical wind profile
  
-There are some already existing projects that can be connected with data processing.+There are some already existing projects that can used in the process of data processing.
  
   * [[http://boinc.berkeley.edu/|BOINC]]   * [[http://boinc.berkeley.edu/|BOINC]]
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 ===== Calculation of meteor trail parameters  ===== ===== Calculation of meteor trail parameters  =====
  
-There already exists a network dealing with similar problem called [[http://meteor.uwo.ca/research/radar/cmor_intro.html|CMOR]], which observes meteors using transmitter and several receiver stations. Such approach is however not suitable for Bolidozor network.+There already exists a network dealing with similar problem called [[http://meteor.uwo.ca/research/radar/cmor_intro.html|CMOR]], which observes meteors using transmitter and several receiver stations. Such approach ishowevernot really suitable for Bolidozor network.
  
 The most realistic solution seems to be a calculations using spatial coordinates of meteor’s head-echo. This approach has already been tested The most realistic solution seems to be a calculations using spatial coordinates of meteor’s head-echo. This approach has already been tested
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 === Meteor detection === === Meteor detection ===
  
-Currently, meteors are detected by comparing the signal intensity in area, where we expect the radio reflection with the signal intensity in area with frequency shift against the transmitted signal. +Currently, meteors are detected by comparing the signal intensity in an area, where we expect the radio reflectionwith the signal intensity in an area with frequency shift to the transmitted signal. 
  
  
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   * Sending a control network packet with a request for data containing the suspicious part from the nearest stations. [[http://www.ros.org/about-ros/|Possiblity of using ROS]].   * Sending a control network packet with a request for data containing the suspicious part from the nearest stations. [[http://www.ros.org/about-ros/|Possiblity of using ROS]].
   * Correlation of detected signal with noise on other stations.    * Correlation of detected signal with noise on other stations. 
-  * As a result of the calculation the corresponding signal should be found in noise on other stations.+  * As a result of the calculationthe corresponding signal should be found in noise on other stations.
   * A detection will be confirmed if the meteor will be detected on several stations at the same time.   * A detection will be confirmed if the meteor will be detected on several stations at the same time.
-  * Otherwise, the event will be evaluated as false detection.+  * Otherwise, the event will be evaluated as false detection.
  
 In case of positive detection, model parameters to calculate the replica have to be extracted from the signal. In case of positive detection, model parameters to calculate the replica have to be extracted from the signal.
  
-Calculation of path will be carried out using several methods. First is the [[https://en.wikipedia.org/wiki/Multilateration|multilateration]] based on different records’ time shifts on individual stations. Time shifts has to be obtained by time correlations of recorded data. This correlation can be carried out either in signal time-space or using Fourier transformations (?? Fourierov obraz).+Calculation of path will be carried out using several methods. First is the [[https://en.wikipedia.org/wiki/Multilateration|multilateration]] based on different records’ time shifts on individual stations. Time shifts have to be obtained by time correlations of recorded data. This correlation can be carried out either in signal time-space or using Fourier transformations. In both cases, it is first necessary to isolate the useful signal of meteor in the noise.
  
 Next step is a measurement of doppler parameters of meteor’s head-echo, which determines the inclination and speed of the path. Next step is a measurement of doppler parameters of meteor’s head-echo, which determines the inclination and speed of the path.
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   - Calculation of meteor position with respect to individual stations (can be done using the reflection from meteor trail).   - Calculation of meteor position with respect to individual stations (can be done using the reflection from meteor trail).
   - Calculation of path vector in absolute coordinates.   - Calculation of path vector in absolute coordinates.
- 
 ==== Data from DVB-T ==== ==== Data from DVB-T ====
  
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   * Command assignment to individual stations.   * Command assignment to individual stations.
-  * Start re-planing due to unsuccessful launch (??vypuštení) or rejection from station. +  * Start re-planing due to unsuccessful launch or rejection from station. 
   * Control of a potential violation of airspace and prohibited zones.   * Control of a potential violation of airspace and prohibited zones.
  
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-(?? dáta) Data on server are reloaded every 5 minutes with [[https://github.com/paulgb/runipy|runipy]] programme. +Scripts on server are reloaded every 5 minutes with [[https://github.com/paulgb/runipy|runipy]] programme. 
  
en/algorithms.1555001811.txt.gz · Last modified: 2019/04/11 16:56 by fluktuacia