预警机蒙皮红外特征与成像仿真技术研究
发布时间：2018-07-16 11:33
【摘要】：预警机(AWACS)是一种集指挥和预警于一体的飞机,是现代空战的空中指挥中心,预警机的重要性日益彰显,对其进行有效的探测和打击对空战的胜利至关重要。近年来,随着隐身材料的广泛应用,雷达探测技术的发展遇到了瓶颈,与此形成对比的是,这类目标运动速度高、红外辐射强烈,有利于通过红外技术达到识别和探测的目的。预警机蒙皮红外辐射特征明显,有利于进行红外探测和成像,进而实现对预警机的探测和打击,具有重要的研究意义。本文分析了空间大气环境的特点,提出了大气透过率计算模型,分析了斜程探测下的短、中、长波红外的大气平均透过率。重点对预警机进行实体建模,并根据真实飞行环境进行了CFD仿真,利用仿真数据和相关算法对蒙皮进行红外辐射特征计算分析。在对蒙皮进行红外特性分析的基础上,利用空间坐标变换和投影映射的方法,仿真得到机身蒙皮的红外图像。最后,对运动中的探测器整流罩进行气动热仿真分析,研究了整流罩气动热对红外成像和探测的影响,提出整流罩温度控制指标。本文主要分为四个部分进行介绍:1.以红外辐射基本理论为基础,先介绍了空间大气的分子密度、温度和压强等参数,并由此提出红外波段大气平均透过率的计算步骤,根据预警机的飞行特点,计算了不同探测行程下的大气平均透过率,为对预警机进行红外辐射特性分析和红外图像仿真提供了重要参数。2.针对预警机的红外特性,对预警机蒙皮的红外辐射特征进行分析,利用SolidWorks软件对预警机建立实体模型,然后用ICEM-CFD软件建立仿真模型并完成网格划分,用Fluent软件对预警机进行CFD仿真,考虑太阳辐射原因得到蒙皮温度分布情况,结合遮挡和消隐相关算法,计算出不同探测方位和探测角度下预警机蒙皮的红外辐射特征,并将分析结果与相关数据进行对比。3.根据对预警机蒙皮红外特征仿真分析的数据,建立红外成像仿真系统模型,利用空间坐标变换和投影映射的方法,并考虑到目标背景和噪声的影响,对预警机蒙皮的红外成像技术进行仿真分析。4.最后,将探测器整流罩气动热看作是环境背景热噪声,对不同运动速度下的整流罩进行建模仿真和气动热分析,研究整流罩气动发热对红外成像结果的影响,并根据红外探测系统的信噪比,提出探测器整流罩温度控制相关指标。
[Abstract]:Early warning aircraft (AWACS) is a kind of aircraft which integrates command and warning and is the air command center of modern air combat. The importance of AWACS is becoming more and more obvious. It is very important to detect and strike AWACS effectively to the victory of air combat. In recent years, with the wide application of stealth materials, the development of radar detection technology has encountered a bottleneck. By contrast, this kind of target has high speed and strong infrared radiation, which is conducive to the purpose of identification and detection through infrared technology. The characteristics of infrared radiation on the skin of AWACS are obvious, which is conducive to infrared detection and imaging, and then to achieve the detection and strike of AWACS, which has an important research significance. In this paper, the characteristics of the space atmospheric environment are analyzed, and a model for calculating atmospheric transmittance is proposed. The atmospheric average transmittance of short, medium and long wave infrared is analyzed under oblique range detection. The solid modeling of the AWACS is emphasized, and CFD simulation is carried out according to the real flight environment. The infrared radiation characteristics of the skin are calculated and analyzed by using the simulation data and related algorithms. Based on the analysis of the infrared characteristics of the skin, the infrared image of the skin of the fuselage is obtained by using the method of space coordinate transformation and projection mapping. Finally, the aerodynamic thermal simulation of the detector fairing in motion is carried out, and the influence of the aerodynamic heat of the fairing on the infrared imaging and detection is studied, and the temperature control index of the fairing is proposed. This article is divided into four parts to introduce. Based on the basic theory of infrared radiation, the molecular density, temperature and pressure of the space atmosphere are introduced, and the calculation steps of the average atmospheric transmittance in the infrared band are put forward according to the flight characteristics of the AWACS. The average atmospheric transmittance under different detection stroke is calculated, which provides an important parameter .2. for infrared radiation characteristic analysis and infrared image simulation of AWACS. According to the infrared characteristic of the AWACS, the infrared radiation characteristics of the skin of the AWACS are analyzed. The solid model of the AWACS is established by SolidWorks, and then the simulation model is established by ICEM-CFD software and the mesh division is completed. The CFD simulation of the AWACS was carried out by fluent software. The temperature distribution of the skin was obtained by considering the reason of solar radiation. The infrared radiation characteristics of the skin of the AWACS were calculated under different detection azimuth and detection angle by combining the occlusion and blanking correlation algorithms. The results of the analysis are compared with the related data. According to the data of infrared feature simulation analysis of the skin of AWACS, the infrared imaging simulation system model is established. The method of space coordinate transformation and projection mapping is used, and the influence of target background and noise is considered. The infrared imaging technology of the skin of AWACS is simulated and analyzed. 4. Finally, the aerodynamic heat of the detector fairing is regarded as the ambient background thermal noise, and the aerodynamic thermal analysis and modeling of the fairing at different moving speeds are carried out to study the influence of the aerodynamic heating of the fairing on the infrared imaging results. According to the signal-to-noise ratio of the infrared detection system, the temperature control index of the detector fairing is put forward.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：E926.37
[Abstract]:Early warning aircraft (AWACS) is a kind of aircraft which integrates command and warning and is the air command center of modern air combat. The importance of AWACS is becoming more and more obvious. It is very important to detect and strike AWACS effectively to the victory of air combat. In recent years, with the wide application of stealth materials, the development of radar detection technology has encountered a bottleneck. By contrast, this kind of target has high speed and strong infrared radiation, which is conducive to the purpose of identification and detection through infrared technology. The characteristics of infrared radiation on the skin of AWACS are obvious, which is conducive to infrared detection and imaging, and then to achieve the detection and strike of AWACS, which has an important research significance. In this paper, the characteristics of the space atmospheric environment are analyzed, and a model for calculating atmospheric transmittance is proposed. The atmospheric average transmittance of short, medium and long wave infrared is analyzed under oblique range detection. The solid modeling of the AWACS is emphasized, and CFD simulation is carried out according to the real flight environment. The infrared radiation characteristics of the skin are calculated and analyzed by using the simulation data and related algorithms. Based on the analysis of the infrared characteristics of the skin, the infrared image of the skin of the fuselage is obtained by using the method of space coordinate transformation and projection mapping. Finally, the aerodynamic thermal simulation of the detector fairing in motion is carried out, and the influence of the aerodynamic heat of the fairing on the infrared imaging and detection is studied, and the temperature control index of the fairing is proposed. This article is divided into four parts to introduce. Based on the basic theory of infrared radiation, the molecular density, temperature and pressure of the space atmosphere are introduced, and the calculation steps of the average atmospheric transmittance in the infrared band are put forward according to the flight characteristics of the AWACS. The average atmospheric transmittance under different detection stroke is calculated, which provides an important parameter .2. for infrared radiation characteristic analysis and infrared image simulation of AWACS. According to the infrared characteristic of the AWACS, the infrared radiation characteristics of the skin of the AWACS are analyzed. The solid model of the AWACS is established by SolidWorks, and then the simulation model is established by ICEM-CFD software and the mesh division is completed. The CFD simulation of the AWACS was carried out by fluent software. The temperature distribution of the skin was obtained by considering the reason of solar radiation. The infrared radiation characteristics of the skin of the AWACS were calculated under different detection azimuth and detection angle by combining the occlusion and blanking correlation algorithms. The results of the analysis are compared with the related data. According to the data of infrared feature simulation analysis of the skin of AWACS, the infrared imaging simulation system model is established. The method of space coordinate transformation and projection mapping is used, and the influence of target background and noise is considered. The infrared imaging technology of the skin of AWACS is simulated and analyzed. 4. Finally, the aerodynamic heat of the detector fairing is regarded as the ambient background thermal noise, and the aerodynamic thermal analysis and modeling of the fairing at different moving speeds are carried out to study the influence of the aerodynamic heating of the fairing on the infrared imaging results. According to the signal-to-noise ratio of the infrared detection system, the temperature control index of the detector fairing is put forward.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：E926.37
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