Research On Real-time Infrared Simulation Of Large-scale Ocean Scene

Infrared imaging technology has a wide range of applications in military and civilian fields such as the testing and training of infrared weapons,target detection,identification and tracking,and disaster relief.In recent years,China has paid constant attention to marine resources,and the study of infrared scene simulation under the typical ocean background has very important practical significance.To this end,based on the theoretical knowledge of infrared physics and related graphics methods to model and simulate the ocean scene,this paper realizes an infrared simulation framework suitable for large-scale ocean battlefield environment,and make a credibility evaluation of the simulation.First of all,the modeling method of the geometric model of the sea surface is studied.After comparing the differences between the four common height field modeling methods,the initial shape of the sea surface based on the sea spectrum model and the fast Fourier transform method is constructed.Berlin noise is added into the height field model to simulate the sea surface disturbance.The grid projection algorithm is used to optimize the scene area problem,and the atomization algorithm is used to solve the edge jagged problem on the distant sea surface,thereby realizing the dynamic simulation of the infinite ocean scene.Secondly,in terms of the infrared radiation characteristics of the sea surface,the calculation model of the infrared radiation of the sea surface is analyzed in this paper.Based on the microplane theory,the Cook-Torrance BRDF reflectance model is derived.The Sea surface intrinsic radiation model,the reflection model of sea surface to the environment radiation,the reflection model of sea surface to the target radiation and sea surface foam radiation model are established.The relationship between the water surface reflection effect and the temperature difference,the observation distance and the observation angle are discussed.In addition,considering the influence of the atmosphere on the transmission of infrared radiation,an atmospheric transmission model is established to calculate the infrared radiation energy before reaching the infrared detector.Then,based on the idea of spreading in neighboring areas,the Kelvin wake model of the ship target is established and superimposed on the height field model of the ocean by solving the two-dimensional wave equation.The cause of the turbulent wake of the ship is analyzed,the width and temperature distribution characteristics of the thermal wake are established,and the ship wake is simulated by the particle system.Through the analysis of the force of the ship floating on the sea,the scene of the ship bumping on the sea is simulated.Using the height map and normal rendering technology,the island elements in the ocean scene are modeled,and the effect of the interaction between the island and the sea is reproduced.Finally,based on the OGRE 3D rendering engine and QT cross-platform development framework,this paper builds an infrared simulation platform suitable for large-scale marine battlefield environments,and analyzes the sea surface simulation results under different wind speeds and weather conditions to evaluate the credibility of the simulation system.