KEYWORDS: Infrared signatures, Thermal modeling, Sensors, Coastal modeling, Atmospheric modeling, Temperature metrology, Data modeling, Mid-IR, Long wavelength infrared, Systems modeling
Numerous improvements have been made to various sub-models in the NATO-standard and USN accredited naval ship infrared signature model (ShipIR) since its last validation in SPIE using ShipIR (v3.2). These include upgrades to MODTRAN5 and MODTRAN6 for the sun, sky, and atmosphere models, and various fixes and improvements to the sea model: corrections to the Fresnel sea reflectance formula (v3.3a), empirical 2nd-order hiding (v3.4), and a recent fix to the sea surface roughness slope distribution (v4.2). This paper will revisit the previous experimental results, used to validate ShipIR (v3.2), first comparing these results against the steady-state version of the thermal solver in ShipIR (v4.2) and complementing these with the transient thermal solver introduced in ShipIR (v4.0).
Numerous improvements have been made to the scene capabilities of ShipIR/NTCS since its early development (Vaitekunas and Lawrence, 1999). This paper will revisit some of the earlier technologies, how they remain largely unchanged except for two important upgrades relating to Open GL 3.0, namely off-screen rendering in hardware using Frame Buffer Objects and 32-bit floating-point colour. The net result is a two order of magnitude (100x) improvement in rendering precision of the infrared scene in ShipIR/NTCS (v4.2). A sample image analysis will investigate the sensitivity of the simulated seeker output to changes in frame buffer resolution (spatial and colour) and the simulation speed.
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