【摘要】 针对隐身飞机的识别和跟踪,研究了临近空间平台对隐身飞机尾焰进行红外探测的作用距离及优势。以F22飞机的尾喷管为原型建立尾焰辐射流场模型,获得了尾焰的温度场与压强场,用微观谱带模型柯蒂斯-戈德索(C-G)近似法计算沿任一观测方向尾焰的辐射特性。考虑采用非轴对称喷管、遮挡板、引射技术和气溶胶遮盖等隐身措施,得到了隐身飞机尾焰在不同探测视角下的红外辐射强度。对红外系统作用距离计算模型未考虑背景辐射强度等不足进行改进,修正探测系统作用距离公式,用目标与背景的辐射强度差替代原目标辐射强度,用MODTRAN软件计算出的单位波数间隔内相应波长下的光谱大气透过率替代大气平均透过率,给出了逐步法求作用距离的流程,并计算出了空间、临近空间和地面不同探测平台对隐身飞机尾焰的红外探测作用距离。结果表明:与其它平台相比,临近空间平台对隐身飞机的探测有更大优势。研究为用临近空间平台对隐身飞机的探测提供了参考。更多还原

【Abstract】 The distance and advantages of near space platform to detect the exhaust plume of stealth aircraft by infrared detection technology were studied for identifying and tracking stealth aircraft in this paper.The flow field model of exhaust plume for simulation was built based on F22 jet nozzle model.The temperature field and pressure field of the exhaust plume were obtained.The infrared radiation characteristics of exhaust plume under different probing directions were calculated by Curtis-Godson method.The infrared radiation intensity of the exhaust plume for stealth aircraft was obtained when the stealth measures of asymmetry nozzle,shadowing plate,ejector technology and aerosol shadowing were in consideration.Aim at improving the disadvantages that the radiation intensity of the background was not considered in the calculation model of infrared system′s function distance,the calculation equation of the function distance was modified.The target radiation intensity was replaced by the radiation intensity difference between the target and the background.The mean atmospheric transmissivity was superseded by atmospheric transmissivity of spectrum related to the respected wave length in the unit wave number which was calculated by MODTRAN software.The flowchart of step method to seek function distance was given.The infrared function distances of space platform,near space platform and ground platform were obtained for the exhaust plume of stealth aircraft.It found that the near space platform had better performance than the other platforms.The research can provide a reference value for using near space exploration platform to detect stealth aircraft.更多还原