Statistical analysis of infrared background radiation
Publish date: 2001-01-01
Report number: FOI-R--0184--SE
Pages: 64
Written in: Swedish
Abstract
Radiation in the infrared region is of great importance for military surveillance. The targets as well as the background have to be characterised. To map the background FOI in Linköping has generated a database of infrared pictures in the wavelength regions 3,5 - 5 micrometer (MWIR) and 8 -12 micrometer (LW R). Data has been collected during one year for different kinds of weather conditions and different times of day and night. The database, that also includes weatherdata, has approximately 1 million infrared pictures. The pictures have been calibrated from grey-levels to radiance and have also been corrected for the influence of the atmosphere. The result is pictures showing the real levels of radiation from the background. An initial statistic analysis has been made. Mean values and standard deviation for both wavelength bands in 16 areas, that represents different types of terrain and objects in the background, have been calculated. The results have been saved as matrixes in Matlab and are easily available for further analysis. The uncertainty estimation shows that the uncertainty varies considerably due to the weather conditions. Most significant is that weather conditions with short visual range leads to high uncertainty.