Aerial Target Infrared Radiation Modeling And Imaging Simulation

The objects’ temperature higher then absolute zero will radiate energy to the space. Aerial targets do high-speed flight in the air. External condition and internal structure will lead to skin temperature distribution change. At the same time, if the engine is working, there will be a large number of high temperature combustion products emitted into the atmosphere, so that it will radiate a large number of infrared radiations. These provide the basis for the detection, tracking and interception of aerial targets. Along with the development of the large scale integrated circuit, the computing speed of computer has been a very significant increase, so that the infrared imaging simulation technology has been widely used. The use of infrared simulation technology could simulate the characteristics of the target realistically. So it could provide design basis for the infrared-guided weapons research.The article takes on research on the infrared radiation characteristics of airborne targets firstly. Mainly study the skin and the plume of the target, which are the mainly proposed of the target. After getting the target radiation intensity on the detection direction, then based on these data we could finally get airborne target infrared simulation images.The article establish the air target’s geometric model, and based on this model divided unstructured grids of the target. Consider the aerodynamic heating of the atmosphere and the heat exchange between the environment and the internal heat transfer between components. Use finite volume method to establish the thermal conductivity equation and solve it. Finally get the airborne targets skin unsteady temperature distribution during flight.Evolve source six flux method mathematical model, which is based on the traditional method of two flux method and six flux method. And as the temperature, pressure and concentration distribution of each component of the plume flow field is known. Wrap the plume in a cylinder, and use source six flux method to solve the transfer equation. Finally get the radiation intensity values of the probe direction.Based on the calculated temperature field, using Planck formula could get the radiation intensity of the skin. And take the consideration of the radiation of the sun, the sky and the ground. Consider the transport of the skin and plum’s radiation in the atmosphere. Through the grid cutting ideas, finally get airborne targets in infrared detector simulation images.