Sea Surface Infrared Scene Simulation Method Based On Sea Spectrum Model

The sea surface infrared scene simulation technology can simulate dynamic sea scene with high realism and strong real-time performance by computing and rendering the model with transferring the computer CPU and graphics hardware GPU.It reduces human and material resources of research institutions in the process of obtaining infrared image,Therefore,it has very important research value.In this paper,the development of sea surface infrared scene simulation technology is analyzed.According to the shortcomings of the existing simulation methods,the research framework of this paper is formulated.First,the sea surface modeling method is compared and analyzed,and the sea surface modeling method based on the sea spectrum model is selected.Then,the infrared radiation model of the sea surface is established.Finally,the simulation of the sea surface infrared scene based on the sea spectrum model is realized.The simulation results are analyzed in detail,and the blindness of the selection of the simulation method of the sea surface infrared scene is solved.The main contents of the research are as follows:(1)The sea surface modeling method is analyzed and studied.The five common modeling methods of sea surface are compared: fluid mechanics,geometric model,fractal geometry,particle system and sea spectrum model.The advantages and disadvantages of the above methods are analyzed,and the modeling method based on the sea spectrum model is selected with considering the realism of the calculation speed and simulation results.This method is divided into linear superposition method and linear filtering method.The two methods are used in converting the PM,JONSWAP and Bretschneider spectra into the corresponding sea surface height fields,and the results of the method are quantitatively analyzed.The results show that the JONSWAP spectrum is the best in the sea spectrum model,the simulation results of linear superposition method is better,but the rate of generation is lower,the linear filtering method is faster and more suitable for large-scale real-time simulation environment.(2)The infrared radiation model of the sea surface is studied.The detector received radiation energy is composed of the radiation energy of the sea surface self,the radiation energy reflected by the sea surface to the environment and the radiation energy of the atmosphere.Firstly,the emissivity,reflectivity,rough sea surface bidirectional reflectance and atmospheric transmittance of the sea surface are discussed.On the basis of this,the sea surface self radiation,the reflection of the sea surface to the ambient radiation and the atmospheric transmission radiation are analyzed.Finally,the model of the infrared radiation characteristics is established.(3)The application value of different sea spectral models in the infrared scene simulation of sea surface is mainly studied.Firstly,the OGRE 3D rendering engine and texture generation technology are introduced.Then,the framework and process of the infrared simulation of the whole sea surface are given.Finally,the simulation of dynamic sea surface infrared scene is realized with the previous related technologies.The simulation results include dynamic sea surface generated by linear superposition method and linear filtering method under different sea conditions.Moreover,the infrared sea surface generated by different sea spectral models is added after the environmental radiation and atmospheric effects are added.The simulation results are analyzed to get the applicable scope of PM spectrum,JONSWAP spectrum and Bretschneider spectrum under the 0-4level sea condition.And the advantages and disadvantages of these three kinds of sea spectra to reflect the effects of solar reflection,sky reflection and atmospheric effects.