Light scattering model for Karma / Grégoire Tremblay, AEREX avionique inc.: D68-3/185-2012E-PDF

"Defence Research and Development Canada – Valcartier (DRDC Valcartier) studies threat warning imaging systems. The Karma engagement simulation framework was used to generate synthetic images as seen by these sensors. In order to provide a valid representation in the ultraviolet band for which the scattering phenomenon through aerosols present in the atmosphere is significant, a scattering model was integrated into Karma's scene generation module. This contract report presents a scattering model able to reproduce the Modulation Transfer Function (MTF) of a source as seen through aerosols. This model was based on the classical Small Angle Approximation (SAA) scheme, which means that the backscattering contribution was neglected. The model was made to produce the MTF on field of views of up to 180°, which is far beyond the usual capacity of these models. Nevertheless, the model adequately reproduced the expected MTF. The frequency content was reproduced adequately. The results of the integration in Karma showed synthetic images including the scattering effect, which was validated against a higher fidelity Monte Carlo model"--Abstract, page i.

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