Analyze The Infrared Diffusion Features Of Fixed-wing Air Targets

The purpose to analyze the infrared diffusion features of fixed-wing aerial targets is to provide theoretical support to detection, recognition and tracking of the target. Because of the difference between the target and the environment, the targrt is distinguished according to calculation and simulation of data and image processing. The methods and image data are provided to improve the accuracy of detection target. Here are the main points of my essay:1. In order to make a geometric modeling of the sea, the fluctuating distribution of space domain sea spectrum is got with the method of FFT based on the JONSWAP spectral model. With the data of SST and SSE, sea radiance is computed by applying Planck law. And sea surface radiance is got by computing BRDF,sunshine and sky radiation.2. In the visible wave, fixed-wing target is geometric modeled and divided. The scattering intensity of each divided part is computed with the help of BRDF of target facial material. Target light-scattering property is got by adding scattering intensity of all the visible surface, and a emulational compute is carried out to get scattering properties space distribution of sunshine and sea background spectrum radiation.3. With the help of FLUENT, the temperature field of target skin aerodynamic heating is computed under the radiation of sun and sea. Target Infrared radiation intensity is computed by radiation transfer equation. It also provides skin infrared radiation image by computing the temperature of different targets,band and height.4. The temperature field and IR of different targets and height plume, and the plume spectrum of different wave band are computed according to the theory of gas radiation,, spectrum modeling, C-G approximation method, SE, FLUENT and GASTURB.Geometric modeling of sea surface is carried out in the essay to provide the features of Sea surface infrared radiation scattering. According to aerodynamic heating principle to make a simulation compute of target skin's the light scattering and infrared radiation. The characteristics of tail jet flame and spectrum are computed emotionally by SE-WORKBENCH to detect and identify the target, which is theoretically supported by the software.