The Infrared Imaging Simulation For Large Ship Under The Sea And Sky

As we all know, our country not only has a large territory, but also has a large of territorial water, and to ensure the safety of the sea is one of the national policies. And the target background infrared simulation of both offense and defense under certain conditions are essential. For the attacking side, researching objective infrared imaging can better identify and track targets for the effective combat; for the defensive side, researching the target infrared characteristics of the target under different target detection and guidance situations so that take effective stealth measures. At this point, the infrared simulation of ship target has been the focus of domestic scholars. The based on this situation, target infrared simulation attempts under the background are made and a large ship infrared imaging under the background of sea and sky related researches are carried out. The main work is divided into the following three parts:(1) The three dimensional geometry model establishment of the rough seasurface and the large shipThe three-dimensional geometric model of rough sea surface and large ship combination is the basis of the large ship infrared imaging under the background of sea and sky. It is the main factor that affects the emissivity and reflectivity in the infrared radiation model. However, because of the complexity of the three-dimensional geometric model, it is difficult to realize it directly using the drawing software. And the thinking of this paper is: Firstly, the rough sea surface model is established by using linear filtering method based on the Cox-Munk sea spectrum model applied extensively. And this geometry model can better reflect the influence of the main factors for it such as wind speed and wind direction and so on. At the same time, the Auto-CAD software is used to build the three-dimensional model of the large ship, and a certain range of sea level is established. Further, two-dimensional linear interpolation is used to establish the sea level by the rough sea surface so that to obtain the three-dimensional geometric model of rough sea surface and large ship combination.(2) Infrared radiation model establishment of the rough sea surfaceInfrared radiation model establishment of the rough sea surface is the process of calculating the parameters of infrared radiation. If we can know the corresponding emissivity and reflectivity model and solar radiation and sky radiation on sea surface, we can get the radiation intensity of rough sea surface and finally finish infrared thermal imaging. In this paper, the Cox-Munk model is used to realize the emissivity and reflectivity model of rough sea surface based on the three-dimensional rough sea surface model. At the same time, the Modtran software is used to simulate the transmissions of 3 ~ 5μm band and 8 ~ 12μm band under different detection angles and solar radiation and sky radiation under the same conditions.(3) Infrared thermal imaging of large ship under sea sky backgroundThis paper establishes the rough sea surface infrared radiation model on the basis of large ship infrared radiation model completed. And then the network cutting method is used to realize in different conditions of infrared thermal imaging of large ship under sea sky background. And the influence of weather conditions, wind speed and spray mist on infrared thermal imaging and infrared thermal imaging in different detection ranges and detection angles are analyzed respectively, and so it can provide the basis for the selection of infrared thermal imaging band and the protection technology.