红外预警卫星直视地表波段选择及探测能力

建立了红外预警卫星直视地表（See-To-Ground，STG）波段探测能力计算模型，并仿真研究了STG最佳探测波段范围以及该波段在导弹预警中可能具备的能力。首先建立了固体、液体导弹尾焰红外辐射模型、地球/大气环境特性模型、点目标辐射通量表观对比度模型、预警卫星系统噪声模型和最低探测高度模型；其次，利用上述模型分析了固体和液体导弹尾焰的表观对比光谱分布规律，认为将STG波段选定为2.86~3.0 m最具合理性；然后，通过分析液体和固体导弹尾焰在该波段的表观对比度光谱随高度的变化规律，初步探讨了STG波段的导弹探测能力；最后，通过分析不同条件下预警卫星对导弹的首次探测高度，系统研究了SBIRS-GEO预警卫星在STG波段的探测能力。研究结果表明:STG波段对固体导弹则具有较强的早期预警能力，而对液体导弹的早期预警能力则相对较弱。

Choice and detectability of See-To-Ground waveband of infrared warning satellite

The detectability of See-To-Ground (STG) wavebands of the infrared warning satellite computational models were constructed, and the possible wavebands range and the role of this STG waveband in missile early warning system were studied by simulation on the basis of those models. Firstly, a series of models for the infrared radiation model of solid and liquid rocket plume, the atmospheric background radiation, the point target radiation flux apparent contrast spectrum, the system noise and the lowest detection height were established. Secondly, the apparent contrast spectrum of solid and liquid rockets plume were analyzed and the STG band was deemed to be 2.86-3.0 m. Thirdly, the detection ability was preliminarily investigated based on the analysis of the rule by which the apparent contrast spectrum of solid and liquid rockets plume varied according to the height. Finally, the detectability of SBIRS-GEO warning satellite at STG band was studied thoroughly, based on the analysis of the first detection height under different condition. The research shows that the STG band possesses superior early warning ability to solid rockets, and weaker early warning ability to liquid rockets.