基于机载IRST系统的高超音速飞行器红外探测研究

Study of Infrared Detection to Hypersonic Vehicle Based on Airborne IRST Systems

针对高超音速飞行器不同于低速飞行器的红外辐射特性,提出了机载IRST系统红外探测高超音速飞行器的建模方法。重点利用高温边界层传热理论建立了高超音速飞行器蒙皮辐射特性模型,分析了排气系统和环境背景辐射特性,根据不同高度下大气层结构分布对红外辐射传输的影响,建立了大气斜程透过率模型,提高了透过率计算的准确性;考虑环境背景辐射的影响,给出了IRST系统对高超音速飞行器的作用距离模型。最后通过仿真实验分析了不同季节、高度和目标仰角下大气透过率特点,分析了不同仰角、速度和波段等因素下探测器对高超音速目标红外作用距离的影响,结论论证了所建模型的实效性。

According to the infrared radiation characteristic of hypersonic vehicle different from low speed vehicle, a modeling method of using airborne IRST system to detect the infrared radiation of hypersonic vehicle is proposed. Emphasis is to establish the model of hypersonic vehicle skin radiation through using the theory of heat transfer of high temperature boundary. The exhaust system and environmental background infrared radiation are analyzed. Based on the influence of structure distribution of atmosphere under different height to infrared radiation, the model of tilt atmospheric transmittance is built, which improves the accuracy of transmittance. Considering the factor of environmental background radiation, the mathematics model of operating range of IRST for hypersonic vehicle is given. Finally, the atmospheric transmittance characteristic is analyzed through considering the different season. Height and angle of target, and some factors, including the elevation, speed and wave band etc., which effect on operating range of hypersonic target are discussed. The conclusion demonstrates the effectiveness of the model.