不同背景下高超声速飞行器红外可探测性分析

Analysis of infrared detectability hypersonic vehicles under different background

为了选择设计红外预警卫星的最优探测谱段范围,采用一种基于目标与背景对比度确定探测谱段的方法,在综合考虑目标、背景及探测方向等因素、结合探测器参量的前提下,分别对类HTV-2飞行器在不同工况、不同观测角度和不同波长范围内的辐射强度、多种地球/大气背景辐射及不同情况下的目标背景对比度进行了理论分析和仿真。结果表明,针对类HTV-2飞行器,正俯视观测时,在30km高度、马赫数Ma=7和50km高度、马赫数Ma=17两种工况下,任一背景下,目标与背景对比度在2.65μm^2.85μm谱段处都较大。该结果对探测这一类目标时的谱段选取具有重要参考价值。

In order to select optimal detection spectrum for infrared warning satellites , a method of determining the detection spectrum based on the contrast between the target and background was adopted. In comprehensive consideration of the target , background , direction of detection and detector parameters , radiation intensity under different conditions , diangles and different wavelength ranges, various earth/atmospheric background radiation, the contrast between the target and background were analyzed theoretically and simulated under different conditions. The results show that , for HTV-2 likevehicles , at the observation of waist-level viewing , under the two conditions of 30km height , M a =7 and 50km height , M a = 17 , the contrast between the target and background is larger in the range of 2. 65 μm to 2. 85 μm. The results are of great reference value for the selection of spectrum in the detection of this kind of targets.