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Active and thermal imaging performance under bad weather conditions

Bernard, Erwan and Rivière, Nicolas and Renaudat, Mathieu and Péalat, Michel and Zenou, Emmanuel Active and thermal imaging performance under bad weather conditions. (2014) In: 6th International Symposium on Optronics in Defence and Security (OPTRO 2014), 28 January 2014 - 30 January 2014 (Paris, France).

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Abstract

Thermal imaging cameras are widely used in military contexts for their night vision capabilities and their observation range; there are based on passive infrared sensors (e.g. MWIR or LWIR range). Under bad weather conditions or when the target is partially hidden (e.g. foliage, military camouflage) they are more and more complemented by active imaging systems, a key technology to perform target identification at long range. The 2D flash imaging technique is based on a high powered pulsed laser source that illuminates the entire scene and a fast gated camera as the imaging system. Both technologies are well experienced under clear meteorological conditions; models including atmospheric effects such as turbulence are able to predict accurately their performances. However, under bad weather conditions such as rain, haze or snow, these models are not relevant. This paper introduces new models to predict performances under bad weather conditions for both active and infrared imaging systems. We first establish an enumeration of these “bad” atmospheric conditions, depending on their occurrence rate. Then we develop physical models to describe their intrinsic characteristics and their impact on the imaging system performances. Finally, we approximate these models to have a “first order” model easy to deploy for industrial applications. This theoretical work will be validated on real active and infrared data.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Thanks to 3AF.
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Other partners > SAFRAN (FRANCE)
Laboratory name:
Funders:
3AF
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Deposited By: Emmanuel Zenou
Deposited On:05 Jun 2014 12:37

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