Infrared propagation and performance modeling at the Electro-Optical Test Facility

Fog spectral transmission data generated in the Electro-Optical Test Facility and propagation models usedm by the authors are presented. Preliminary results of a modeling effort are presented that support the following conclusions: (1) atmosphere emission is a major factor in IR system performance despite the fact it is commonly omitted; (2) the 3.5-4.1-microm interval offers superior performance to the 3-5 band at both relatively short and long ranges; and (3) the longer wavelength 9.5-11.5-microm band is superior to either the 3-5 or 3.5-4.1 bands in the presence of fog.