Infrared Radiation Analysis And Imaging Simulation Of Aerial Target

The infrared spectral radiation characteristics of aerial targets are one of the important basis for photoelectric detection,recognition and tracking of targets.The research on the infrared radiation characteristics of aerial targets has a very important research value in deepening the stealth technology of the target,detecting the stealth target and improving the working efficiency of the infrared detector.Aerial targets are different from space targets,for the reason that the environmental conditions and flight status they moving are complicated and variable,and that there is a huge difference between the skin and high-temperature plume in infrared radiation characteristics of different band.Therefore,studying the multi-band infrared radiation characteristics of aerial targets received by detectors in different platforms is great significance for improving the detection efficiency of infrared detectors in different working environments.The launch cost of aerial targets such as aircraft is high,and the infrared radiation characteristics of targets under complex conditions are difficult to obtain,so modeling and imaging simulation of infrared radiation characteristics of aerial targets can save costs in field tests and shorten the development time of infrared detectors and provide effective evaluation.Aiming at the application requirements of aerial target detection and recognition,this paper has completed the theoretical modeling and imaging simulation of the infrared radiation characteristics of typical aerial targets,studied the infrared radiation characteristics of the targets in different detection platforms and the environmental impact,researched and optimized the key technology in infrared imaging simulation,and built an infrared imaging simulation platform for aerial targets,which provides an important reference for the selection of detector parameters and detection angles for aerial targets infrared imaging detection system.Specifically,the main research work in this paper is as follows:1.The multi-spectral infrared radiation characteristics of the aerial target' skin,tail nozzle and plume are theoretically analyzed and modeled.Based on the stagnation temperature algorithm,the skin temperature was calculated,and the effects of target flight speed,flight altitude and the ground environment on the skin infrared radiation were analyzed.Based on the C-G band model algorithm,the collision broadening effect and the Doppler broadening effect to model the plume.The infrared radiation characteristics of the plume in the short-wave are analyzed.2.The key technologies in the infrared scene simulation of aerial target are studied.Aiming at the problem of target's self-infrared infrared radiation received by the detector,the solar radiation,ground radiation and sky background radiation are comprehensively considered,and established the heat balance equation of the skin.The ray casting algorithm was used to analyze the visibility of the target facets and calculate the spontaneous infrared radiation.For the environmental radiation problem in the infrared scene simulation software,a reflected radiation model based on the Cook-Torrance algorithm,regarded the skin facets as micro-panels,was established,which based on the probability model,and fully consider the various ambient light sources in the scene.3.For airborne,ground-based and space-based detection platforms,the effects of detection angle,flight attitude angle,atmospheric propagation,ambient radiation and detection band on the target infrared radiation characteristics received by the detector are analyzed.The MODTRAN's atmospheric radiation propagation software is used to calculate the atmospheric path radiation and atmospheric transmittance in the detection direction.The improved radiometric contrast model is used to analyze the detection efficiency under different detection conditions,and analyze the optimal detection angle under specific conditions and the optimal detection band in specific detection conditions.4.Aiming at the authenticity of infrared radiation characteristic modeling and infrared scene simulation of the target,the real infrared images taken in the laboratory environment are compared with the generated simulation images to verify the authenticity of the model.In this paper,the infrared radiation characteristics of the aerial target are analyzed.Based on the key technologies of infrared scene simulation,the infrared scene simulation platform suitable for the aerial target was built to improve and integrate the infrared scene simulation software and created conditions for the performance evaluation of detection system.