BRAMS

 Listen to the meteors

BRAMS Data Viewer

The BRAMS data viewer is an online tool developed by Yves Geunes (BISA) which allows BRAMS users to access data already archived at BISA. The user can visualize the spectrograms and download the related WAV files.

The BRAMS data Viewer uses a C code developed by Emmanuel Gamby (BISA) to create the spectrograms automatically from the corresponding WAV file. The method searches for the frequency of the beacon carrier and by default centers the spectrogram around it with a total frequency range of 200 Hz. Sometimes due to the presence of an intense and constant parasitic signal nearby the frequency of the beacon carrier, the search fails and the spectrogram does not plot the correct frequency range. To avoid this situation, some well known exceptions have been added to the code. In case this fails as well, the user can change manually the frequency range if needed (option added soon)


You can access the BRAMS data viewer HERE.


Please have a look at the description of the BRAMS data Viewer below before using it for the first time


If you experience any problem either with the system itself or with some of the data (spectrogram or WAV file), please let us know by using the form below. Thank you.



How to use the BRAMS data Viewer?


  1. On top of the page are listed all BRAMS stations with existing data in the archive. Click on one or several stations for which you want to access the data. You need to click on the box. If you click on the name, the Corbais station is selected.
  2. Click on the "request data" button. Two fields "date" and "time" will appear.
  3. Select a date (a calendar will appear when you click in that field) and one hour (a scrolling menu will appear) for that day.
  4. Click again on the "request data" button
  5. A window appears below with the files available for that specific hour/date (e.g. 2001-03-31 04:15). If no data are available for this (these) station(s) and specific date/hour, no files will appear. Choose another selection
  6. If you click on one of these files, the corresponding spectrograms will appear in the main window below. If you selected several stations, the files will appear one below each other by alphabetic order of the stations
  7. If you select several of these files, the corresponding spectrograms will appear horizontally next to each other, ordered by time
  8. If you ask for more station or data than the screen can show, just scroll down or horizontally with your browser to move through the different stations or time frames
  9. If you click on one spectrogram, a larger version appears and it also has more detailed axis (allowing a rough measurement of time and frequencies of a specific event)
  10. In the top right part of the screen, a number of buttons are available :
    • allows the user to loop through other spectrograms from the same station (but always within the hour you have initially selected)
    • allows the user to loop through other spectrograms from the same station (but always within the hour you have initially selected)
    • allows the user to browse through the all the selected images of one station with a small movie. Once the movie has started, a cross button appears instead. Click on the cross to stop the movie
    • allows the user to save the corresponding WAV file.
    • allows the user to save the spectrogram itself (PNG format).
    • allows the user to exit this spectrogram screen and go back to the general BRAMS data viewer
    • allows the user to loop through spectrograms of other stations at a given time (but only for those stations you have initially selected)
    • allows the user to loop through spectrograms of other stations at a given time (but only for those stations you have initially selected)