选择合理的探测波段是设计红外预警卫星需要解决的重要问题.提出了一种基于点目标辐射通量表观对比度光谱确定红外预警卫星探测波段的方法.论文首先建立了较完善的火箭尾焰表观对比度光谱计算模型, 进一步建模计算了典型液体和固体火箭尾焰在不同高度的红外辐射特性, 使用通用大气辐射传输(CART)软件计算了典型大气条件下的地球/大气背景辐射以及不同高度处大气的透过率和路径辐射, 在此基础上以典型液体和固体火箭为例, 计算了尾焰在不同高度处的辐射通量表观对比度光谱.结果表明： 不论液体还是固体火箭, 在2.55～2.85μm和4.19～4.48μm波段的辐射通量表观对比度都比较大, 红外预警卫星工作波段可以选为上述波段.

The selection of detection band is fundamental to the design of infrared warning satellites. An approach adopting point target radiation flux apparent contrast spectrum to select the detection band was proposed in this paper. A relatively complete model calculating the apparent contrast spectrum of rocket plume was founded at first. Then the infrared radiation spectral characteristics of typical liquid and solid rockets at various altitudes were obtained by modeling and simulating. Finally, the infrared radiation of background and the transmittances and path radiation of atmosphere were calculated using the combined atmospheric radiative transfer(CART). Based on the above results, the apparent contrasts spectral of typical liquid and solid rockets at various altitudes were gained. Results of both liquid and solid rockets show that, the apparent contrast at 2.55～2.85μm and 4.19～4.48μm are higher than other bands, and might be suitable for the infrared warning satellites detection band chosen by the space based infrared system.