Analysis of infrared detectability hypersonic vehicles under different background

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, different observation angles and different wavelength ranges, various earth/atmospheric background radiation, the contrast between the HTV-2 aircraft target and background were analyzed theoretically and simulated under different conditions. The results show that, for HTV-2 like vehicles, at the observation of waist-level viewing, under the two conditions of 30km height, Ma=7 and 50km height, Ma=17, the contrast between the target and background is larger in the range of 2.65μm to 2.85μm. The results are of great reference value for the selection of spectrum in the detection of this kind of targets.