Abstract
To study of the infrared signature of an aerial target, it is required to precisely model the background radiation. Simple empirical models or standard atmospheric models in LOWTRAN/MODTRAN were used in earlier studies. To further precisely model the thermal radiation of earth’s surface and atmospheric radiance/transmittance, the atmospheric profile, land surface temperature, and emissivity, the sea surface temperature retrieved from moderate-resolution imaging spectroradiometer, and the sea surface emissivity model developed by Wu and Smith are utilized in this study. Meanwhile, considering that the reflection of background radiation incident from different directions in each spectral wavelength can be calculated in parallel, implementations using open multi-processing and compute unified device architecture on a multi-core CPU and many-core graphics processing unit (GPU) are presented and speedups of 9 $$\times$$ and 258 $$\times$$ are obtained on a platform with dual Xeon E5-2652 CPU and an NVIDIA Tesla K80 GPU card, respectively.
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