HIDE Revised Wavelength Resolution Emission and Transmission Model.
Abstract
This report describes the high resolution atmospheric transmission and exhaust gas emission models to be incorporated into the HIDE(Helicopter infrared detection estimate) computer model. HIDE is intended to predict the infrared signature of suppressed aircraft. 'Suppressed', as used here, implies masking of all hot metal, diluting exhaust plume gases and reducing body contrast with the background. Attention must be applied to the entire spectrum of interest (1-16 microns) and over long paths (such as 40 air masses for a line of sight tangent to the horizon). This is because the signatures of self emitting sources are influenced by the relatively short intervening paths and generally dominate some spectral interval. The body contrast signature, however, is comprised from remote sources (i.e. sun, sky, albedo, etc.) which traverse long atmospheric paths to illuminate the target and this signal is contrasted against a remote background (horizon, terrain, clouds, etc.) whose radiance has also been operated on by long path constituents.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 28, 1974
- Accession Number
- ADA042624