Real-time Infrared Characterization Simulation and Research of Wind-roughened Sea Surface

The sea surface is an important background of sea surface targets and its infrared radiation characterization is the basis of infrared detection and recognition of sea surface targets. The model of linear wave theory and JONSWAP spectrum was used to achieve shape and display of ocean wave. Real-time infrared characterization simulation model was established for the sea surface, considering the solar radiance, the sky background radiance and the effects of atmospheric transmission. The sea surface was divided into many wavelet facets and the radiance of every facet was calculated on the basis of infrared simulation model. Three typical time, 9:00, 12:00, 15:00 in one day were selected and the radiance of every facet about 3~5μm and 8~12μm waveband was respectively calculated. Real-time infrared simulation images of sea surface were generated by converting wavelet facets radiance value to image gray value. The results show that the sea surface infrared images of 3~5μm waveband display the bright spots of reflected solar irradiance, and the spots appear the same direction with the solar azimuth while the impact of solar irradiance in 8~12μm waveband isn’t usually required, and the method can effectively simulate the sea surface infrared characterization and provide the basis for infrared detection and recognition of sea surface targets.