Accession Number : ADA276919


Title :   Atmospheric Propagation Effects through Natural and Man-Made Obscurants for Visible to MM-Wave Radiation (Les Effets des Conditions Defavorables de Propagation sur les Systemes Optiques, IR et a Ondes Millimetiques)


Descriptive Note : Conference proceedings


Corporate Author : ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE)


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a276919.pdf


Report Date : Nov 1993


Pagination or Media Count : 209


Abstract : Modern, precision-guided weapons require that guidance and target acquisition/recognition systems take into account the effects of the propagation environment. Successful performance must be obtained under adverse weather conditions such as haze, clouds, fog, rain, snow and under adverse battlefield conditions such as dust, smoke and man-made obscurants. Sensors operate at wavelengths ranging across the millimetre, IR and the visible regions of the electromagnetic spectrum. Propagation effects vary drastically over this wavelength span and systems may employ a combination of sensors to mitigate adverse environmental conditions. The effectiveness of countermeasures such as multispectral obscurants and multispectral camouflage also depends on atmospheric properties. System performance is measured in terms of probability of detection, probability of recognition and, ultimately, in terms of probability of a kill. A partial listing of the processes that affect theses probabilities and, in turn, are affected by the propagation environment includes extinction, angles and amplitude scintillation, target to background contrast, contrast transmission and clutter characteristics. The Symposium will address the following topics: (1) Natural obscurants; (2) Multispectral camouflage; (3) Man-made obscurants and battlefield-induced phenomena; and (4) Target and background signatures.


Descriptors :   *CAMOUFLAGE , *OPTICAL COUNTERMEASURES , *ELECTROMAGNETIC SPECTRA , *OBSCURATION , NATO , SYMPOSIA , WEATHER , TARGET RECOGNITION , CLUTTER , ELECTROMAGNETIC WAVE PROPAGATION , FRANCE , INFRARED COUNTERMEASURES , MULTISPECTRAL , INFRARED SPECTRA , GUIDED WEAPONS , TARGET DETECTION , ELECTROMAGNETIC RADIATION , MILLIMETER WAVES , PROBABILITY , KILL PROBABILITIES , TARGET SIGNATURES , BATTLEFIELDS


Subject Categories : Meteorology
      Countermeasures
      Radio Countermeasures
      Optical Detection and Detectors
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE