Simulation Research Of Infared Sea Surface And Ship Wake

Infrared simulation of sea surface and ship wake has great significance to the research of sea-guided weapons.The simulation of sea background based on physical modeling and high-reality ship wake directly affects the reality of the scene.In this paper,the dynamic simulation of infrared sea scene and ship wake is achieved by infrared physics knowledge and computer graphics.In this thesis,the development of infrared ocean scene and ship wake simulation is analyzed.According to the shortcomings of existing simulation methods,the models of sea surface height field and the sea surface infrared radiation are improved.Meanwhile,the Kelvin wave and thermal wake generated by ship motion are researched.The dynamic simulation of the scene is realized,which has richer physical details and increases the authenticity of the scene.The main research contents are as following:(1)The model of sea surface height field is studied.The sinusoidal wave height field model and the ocean spectrum height field model are analyzed.Then the sea surface height field is modeled by using the hybrid the above two models.So,the sea surface can represent the sea surface of the sea spectrum model in near view which shows more details,and the sea surface with sinusoidal wave superimposing noise is used in the far distance to make the sea surface more random so that the sea suface has lower repeatability.(2)The infrared radiation model of sea surface is researched,including the emissivity model of sea surface,the reflection model of sea surface to the sky radiation and solar radiation,and the reflection model of sea surface to the ship target.The atmospheric effect model is added to the sea surface intrinsic radiation model to obtain the distribution of infrared radiation before reaching the detector.(3)Based on the sea surface height field,the simplified linear shallow water wave equation is used to model the Kelvin wave height field.At the same time,the generation process of the thermal wake is analyzed,the morphological characteristics of the thermal wake are modeled and the temperature distribution characteristics are analyzed,and the dynamic simulation of the thermal wake is applicated by using the method of particle system.(4)In this thesis,Unity3 D is used as rendering engine to realize the dynamic simulation of infrared sea surface and ship wake.The rendering results of sea surface height field under different wind speeds are presented,and the reflection radiation image of the ship is analyzed.The wake simulation and atmospheric effect simulation under different motion states of the ship are given.The simulation results are analyzed,which proves the reality and validity of the scene simulation.