Aircraft and Cosmic Background

The Aircraft and Cosmic Background Calibration tool processes data acquired over lines flown at various heights at hight altitude – typically in the range 1,000 m to 3,500 m. The tool performs linear regression of channel (or window) counts vs cosmic window counts to estimate the aircraft and cosmic spectra and their associated window calibration coefficients. To use this tool:

• Set the aliases and parameters – File|Set Aliases and Parameters;
• The calibration lines are selected from the database using the file icon buttons on the UI;
• Click Calculate to initiate the processing. A summary of the results are given on the UI. To see the full output, view the log file – File|View User Log File. 
• CheckBoxes above the regression plot window can be used to toggle through the regressions. The checkBoxes below the Include panel can be used to include or exclude specific lines from the regressions.
• Save the calibration results, which include the aircraft and cosmic spectra, to a file using the Save button. This file is used for background estimation during airborne processing, and by the Spectral-Ratio C1 calibration tool.

Quick Link: Descriptions of the aliases and parameters used by this tool can be found in the aircraft and cosmic control file.

See Tutorial 5: Aircraft And Cosmic Background Calibration for a tutorial on the use of this tool.