Dynamic Infrared Image Simulation Of Ship Wake On Sea Surface

With the development of military technology,the positioning and tracking of marine ships,submarines and other targets have become one of the hot spots of military research in various countries.Among them,ship wake is the most obvious feature of moving ships on the sea,and contains abundant ship information.Since the images of ship wake on sea surface are not easy to obtain,it is difficult to carry out related research on ship wake.In order to meet the needs of ship wake infrared radiation related research on ship wake infrared images,establish a simulation model of infrared radiation image of ship wake on sea surface based on physical model,and use the Unity 3D simulation engine to simulate the infrared image of ship wake on sea surface.This thesis simulates the infrared radiation image of the wake of a ship.In order to simulate the physical characteristics of the infrared radiation of ship wake on sea surface,starting from the physical model of the ship’s wake,establish the height field model of sea surface,the height field model of Kelvin wake and the infrared radiation model of ship wake on sea surface.In order to meet the requirements of real-time simulation and high-fidelity simulation,choose the method of texture mapping for simulation,and use GPU parallel processing to accelerate simulation calculation.The main research contents are as follows:(1)This thesis studies the height field modeling methods of sea surface and Kelvin wake.Compared and analyzed the methods currently used,This thesis chooses the sea surface height field modeling method based on Phillips spectrum model and the Kelvin wake height field modeling method based on gravity wave.And convert the sea spectral model to the sea surface height field using the Fast Fourier method,and obtain a height field model of ship wake on sea surface that is more in line with the laws of physics.(2)This thesis researches and establishes the infrared radiation model of ship wake on sea surface.Analysis on the principle and composition of infrared radiation of ship wake on sea surface and establish a more comprehensive infrared radiation model of ship wake on sea surface.Including the self-radiation model of sea surface and Kelvin wake;reflection model of solar radiation and sky background radiation by sea surface and Kelvin wake;the self-radiation model of the thermal wake caused by the agitation of the seawater by the dynamic system and the self-radiation model of the thermal wake caused by the thermal drainage of the dynamic system;attenuation model of atmospheric radiation to infrared radiation.(3)This thesis uses the Unity 3D simulation engine for simulation,and uses the simulation methods of texture maps and the method based on GPU parallel computing to accelerate the simulation.Simulate the infrared image of ship wake on sea surface and obtain a simulation system with both high simulation realism and high simulation efficiency.Finally,simulate the infrared images of ship wake on sea surface under different conditions,summarize the simulation results to verify the authenticity and validity of the simulation.