复杂背景下低轨红外探测器对隐身飞机目标的探测性分析

Analysis on detectability of stealth aircraft targets by low orbit infrared detectors in complex backgrounds

以STSSLEO天基红外探测器为例,分析近地轨道红外探测器对国外某隐身飞机目标的探测能力.首先进行了隐身飞机目标的机身气动热分析、发动机喷口及尾焰热分析和辐射分析;然后对海洋-云层-大气的光谱辐射特性及耦合特性进行定量分析,计算得到在给定探测场景(经纬度、季节、时段、风速、光照、大气)及探测谱段下的辐射强度分布;最后基于上述分析结果,给出了星下点模式探测能力分析.结果表明,STSSLEODemo红外探测器在星下点观测模式下,在云层遮挡时的最低信噪比19.2~26.1明显高于阈值信噪比6,完全可以透过云海背景探测并识别隐身飞机目标的尾焰辐射信号.

Taking the STSS LEO space-based infrared detection platform as an example,this paper analyzes the capability of low earth orbit infrared detector to detect a foreign stealth aircraft target.The paper first performs the aerodynamic thermal analyses on the fuselage,thermal analysis of engine nozzle and tail flame,as well as radiation analysis of the stealth aircraft target,and then makes quantitative analyses on the spectral radiation characteristics and coupling characteristics of ocean-cloud-atmosphere,calculating to obtain the distribution of infrared radiation intensity under the given detection scenario(longitude and latitude,season,period of time,wind speed,light and atmosphere)and the given detection spectral range.Finally,based on the above analysis results,the paper presents the analysis on detection capability of sub-satellite point mode.The results show that,in the observation mode of sub-satellite point,STSS LEO Demo infrared detector has the lowest SNR 19.2~26.1 under cloud occlusion,which is significantly higher than the threshold SNR 6,and thus it can completely pass through cloud-sea background to detect and identify the tail flame radiation signal of stealth aircraft targets.