Scattering Calculation Of Target From The Background Infrared Radiations Based On GPU

The infrared background radiation from the sky, the earth and the sun are calculated separately by using the atmospheric transmission software MODTRAN, which provides the prerequisite conditions for the research of the infrared scattering characteristics of complex targets. In this paper, computational unified device architecture (CUDA) technology based on Graphic Processing Unit (GPU) is used for paralleling the spectral scattering calculation of background infrared radiation from complex target, and optimized this algorithm according to the GPU hardware features. In the process of scattering calculation, the bidirectional reflectance distribution function (BRDF) of five parameter model is utilized in describing the spectral scattering properties of target facets. The performance of the CUDA parallel calculation and CPU calculation are compared and analyzed through computing the scattering intensity of the target models with different number of facets, and the calculation results show that the CUDA parallel calculation speed improves more than one hundred times. According to rough surface scattering theory and the theory of heat radiation, the calculation process of the target infrared spectral characteristics in the complex sea and sky background radiation is showed. By this process, developed the simulation software named "The sea and sky background target infrared characteristics calculation" Version 1.0. Finally, using this software calculated and analyzed particularly the angular distribution of infrared scattering intensity from the different types of complex targets over the sea in 3-5 ? mand 8-12 ? m wave bands, different surface materials, different observation attitude.