
Proceedings Paper
The prediction of the optical contrast of air-borne targets against the night-sky background for Photopic and NVG sensorsFormat | Member Price | Non-Member Price |
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Paper Abstract
The Havemann-Taylor Fast Radiative Transfer Code (HT-FRTC) represents transmittances, radiances and fluxes by
principal components that cover the spectra at very high resolution, allowing fast highly-resolved pseudo line-by-line,
hyperspectral and broadband simulations across the electromagnetic spectrum form the microwave to the ultraviolet for
satellite-based, airborne and ground-based sensors. HT-FRTC models clear atmospheres and those containing clouds and
aerosols, as well as any surface (land/sea/man-made). The HT-FRTC has been used operationally in the NEON Tactical
Decision Aid (TDA) since 2008. The TDA combines the HT-FRTC with a thermal contrast model and an NWP model
forecast data feed to predict the apparent thermal contrast between different surfaces and ground-based targets in the
thermal and short-wave IR. The new objective here is to predict the optical contrast of air-borne targets under realistic
night-time scenarios in the Photopic and NVG parts of the spectrum. This requires the inclusion of all the relevant
radiation sources, which include twilight, moonlight, starlight, airglow and cultural light. A completely new exact
scattering code has been developed which allows the straight-forward addition of any number of direct and diffuse
sources anywhere in the atmosphere. The new code solves the radiative transfer equation iteratively and is faster than the
previous solution. Simulations of scenarios with different light levels, from situations during a full moon to a moonless
night with very low light levels and a situation with cultural light from a town are presented. The impact of surface
reflectance and target reflectance is investigated.
Paper Details
Date Published: 21 October 2016
PDF: 10 pages
Proc. SPIE 9987, Electro-Optical and Infrared Systems: Technology and Applications XIII, 99870O (21 October 2016); doi: 10.1117/12.2241966
Published in SPIE Proceedings Vol. 9987:
Electro-Optical and Infrared Systems: Technology and Applications XIII
David A. Huckridge; Reinhard Ebert; Stephen T. Lee, Editor(s)
PDF: 10 pages
Proc. SPIE 9987, Electro-Optical and Infrared Systems: Technology and Applications XIII, 99870O (21 October 2016); doi: 10.1117/12.2241966
Show Author Affiliations
Stephan Havemann, Met Office (United Kingdom)
Gerald Wong, Met Office (United Kingdom)
Published in SPIE Proceedings Vol. 9987:
Electro-Optical and Infrared Systems: Technology and Applications XIII
David A. Huckridge; Reinhard Ebert; Stephen T. Lee, Editor(s)
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