空中目标红外辐射建模及成像仿真
发布时间：2019-03-07 09:12
【摘要】：温度高于绝对零度的物体都会向外辐射出能量,空中目标在空中做高速飞行,外部条件以及内部结构的不同都会导致空中目标蒙皮温度场分布产生变化。同时当发动机处于工作状态时,会有大量的高温燃烧产物排放到大气之中,向外进行大量的红外辐射。这些都为空中目标的探测、追踪以及拦截提供了依据。随着大规模集成电路的发展,计算机计算速度大幅提高,红外仿真技术也得到了迅速发展。利用红外仿真技术可以逼真的对目标的红外特性进行成像仿真,可为红外制导武器的研制设计依据。本文对空中目标的红外辐射特性进行了研究,主要对组成空中目标辐射源的蒙皮与尾焰在探测方向上的辐射强度进行计算,并在此基础上进行红外成像,最终得到空中目标的红外仿真图像。本文首先建立了空中目标的几何模型,并对其进行了非结构网格的划分,在综合考虑外部大气对目标蒙皮的气动加热、外部环境对目标蒙皮的投入辐射以及目标内部各部件间的换热的基础上,采用有限体积法建立导热方程,并对其进行离散求解,最终得到空中目标在飞行过程中蒙皮的非稳态温度场分布情况。其次,在传统二流法和六流法的基础上,对由传统热流法演变得到的源项六流法数学模型进行研究,并在已知尾焰流场的温度、压强以及各组分浓度分布的前提下,将尾焰包裹在一个圆柱体内,采用源项六流法对辐射传递方程进行求解,最终得到探测方向上的辐射强度值。最终,由计算得到的蒙皮温度场分布,通过普朗克公式求得目标蒙皮的本征辐射强度,同时考虑太阳、天空以及地面在蒙皮上反射到探测器方向的辐射强度。在考虑蒙皮及尾焰辐射在大气中的传输效应的基础上,通过网格裁剪以及“深度缓存”的思想,最终得到空中目标在探测器上的红外仿真图像。
[Abstract]:Objects whose temperature is higher than absolute zero will radiate energy out of the air. The different external conditions and internal structure will result in the change of the temperature field distribution of the skin of the aerial target due to the high-speed flight of the aerial target in the air. At the same time, when the engine is in operation, a large number of high-temperature combustion products will be emitted into the atmosphere, and a large amount of infrared radiation will be carried out outward. All of these provide a basis for the detection, tracking and interception of aerial targets. With the development of large scale integrated circuits (LSI), the computer computing speed has been greatly increased, and infrared simulation technology has also been developed rapidly. Infrared simulation technology can be used to simulate the infrared characteristics of target realistically, which can be used as the basis for the development and design of infrared guided weapons. In this paper, the infrared radiation characteristics of aerial targets are studied. The radiation intensity of the skin and the plume of the aerial target radiation source is calculated in the direction of detection, and the infrared imaging is carried out on this basis. Finally, infrared simulation images of aerial targets are obtained. In this paper, the geometric model of the aerial target is first established, and the unstructured mesh is divided into two parts, and the aerodynamic heating of the target skin by the external atmosphere is considered comprehensively. On the basis of the input radiation of the external environment to the target skin and the heat transfer between the components inside the target, the heat conduction equation is established by the finite volume method, and the heat conduction equation is solved by discrete method. Finally, the unsteady temperature distribution of the skin during the flight process of the aerial target is obtained. Secondly, on the basis of the traditional two-flow method and the six-flow method, the mathematical model of the source-term six-flow method derived from the traditional heat flow method is studied, and on the premise of known temperature, pressure and concentration distribution of each component in the wake flow field, The tail flame is wrapped in a cylinder and the radiative transfer equation is solved by the source term six-current method. Finally, the radiation intensity in the direction of detection is obtained. Finally, based on the calculated temperature distribution of the skin, the intrinsic radiation intensity of the target skin is obtained by Planck formula, and the radiation intensity of the sun, the sky and the ground reflected from the skin to the direction of the detector is also taken into account. On the basis of considering the propagation effect of the skin and flame radiation in the atmosphere, the infrared simulation image of the aerial target on the detector is obtained through the idea of mesh clipping and "depth buffer".
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TJ01;TN219
本文编号：2435978
[Abstract]:Objects whose temperature is higher than absolute zero will radiate energy out of the air. The different external conditions and internal structure will result in the change of the temperature field distribution of the skin of the aerial target due to the high-speed flight of the aerial target in the air. At the same time, when the engine is in operation, a large number of high-temperature combustion products will be emitted into the atmosphere, and a large amount of infrared radiation will be carried out outward. All of these provide a basis for the detection, tracking and interception of aerial targets. With the development of large scale integrated circuits (LSI), the computer computing speed has been greatly increased, and infrared simulation technology has also been developed rapidly. Infrared simulation technology can be used to simulate the infrared characteristics of target realistically, which can be used as the basis for the development and design of infrared guided weapons. In this paper, the infrared radiation characteristics of aerial targets are studied. The radiation intensity of the skin and the plume of the aerial target radiation source is calculated in the direction of detection, and the infrared imaging is carried out on this basis. Finally, infrared simulation images of aerial targets are obtained. In this paper, the geometric model of the aerial target is first established, and the unstructured mesh is divided into two parts, and the aerodynamic heating of the target skin by the external atmosphere is considered comprehensively. On the basis of the input radiation of the external environment to the target skin and the heat transfer between the components inside the target, the heat conduction equation is established by the finite volume method, and the heat conduction equation is solved by discrete method. Finally, the unsteady temperature distribution of the skin during the flight process of the aerial target is obtained. Secondly, on the basis of the traditional two-flow method and the six-flow method, the mathematical model of the source-term six-flow method derived from the traditional heat flow method is studied, and on the premise of known temperature, pressure and concentration distribution of each component in the wake flow field, The tail flame is wrapped in a cylinder and the radiative transfer equation is solved by the source term six-current method. Finally, the radiation intensity in the direction of detection is obtained. Finally, based on the calculated temperature distribution of the skin, the intrinsic radiation intensity of the target skin is obtained by Planck formula, and the radiation intensity of the sun, the sky and the ground reflected from the skin to the direction of the detector is also taken into account. On the basis of considering the propagation effect of the skin and flame radiation in the atmosphere, the infrared simulation image of the aerial target on the detector is obtained through the idea of mesh clipping and "depth buffer".
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TJ01;TN219
【参考文献】
相关期刊论文 前3条
1 李艳晓;郑国锋;张红刚;王合龙;;大气传输效应对红外成像仿真的影响[J];大气与环境光学学报;2014年06期
2 余慧娟;黎兰;刘相新;韦学中;;地面目标红外成像仿真系统的设计与实现[J];红外技术;2013年01期
3 张晓阳;徐琰珂;付奎生;;红外成像导引头视场选择及搜索策略设计[J];红外与激光工程;2014年12期
，本文编号：2435978
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