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针对星载激光告警系统的虚警问题,研究了星载环境下典型近红外告警探测器的辐射环境。分析了卫星环境下能够造成虚警的干扰辐射源,对各种辐射源在典型攻击激光波段的辐射特性进行了数值计算。结果表明:星载激光告警系统的主要背景辐射源为太阳和地球,在波长小于4μm的光谱区域,太阳辐射产生的背景干扰起主要作用,而在大于4μm的波长区域里,太阳辐射迅速衰减,地球辐射成为主要的背景辐射。在1.315μm COIL攻击激光波段,太阳辐射照度达到51.4 mW.cm-2,在10.6μm CO2威胁激光波长处,地球辐射值为2.43 mW.cm-2,需要重点抑制。闪电辐射是主要的目标干扰辐射源,在整个近红外波段的平均辐照度为几百mW.cm-2,需要采取相关探测技术克服。
Aiming at the false alarm problem of the spaceborne laser warning system, the radiation environment of a typical near-infrared warning detector under spaceborne environment is studied. The interference radiation sources that can cause false alarm in satellite environment are analyzed, and the radiation characteristics of various radiation sources in typical attack laser wavelength range are numerically calculated. The results show that the main background radiation source of the spaceborne laser warning system is the sun and the earth. The background interference caused by solar radiation plays a major role in the spectral region of wavelength less than 4μm. However, in the wavelength region> 4μm, the solar radiation decays rapidly, Earth’s radiation becomes the main background radiation. In the 1.315μm COIL attack laser band, the solar irradiance reaches 51.4 mW · cm-2. At the 10.6μm CO2 threat laser wavelength, the Earth’s radiation value is 2.43 mW · cm-2, which needs to be focused on. Lightning radiation is the main target interference radiation source, and the average irradiance in the entire near infrared band is several hundred mW.cm-2, which needs to be overcome by relevant detection technologies.