亚像元火点对红外预警卫星的辐射干扰特性

亚像元火点是红外预警卫星的辐射干扰源，基于推导火点像元辐射强度方程，对不同条件下的火点像元在2.55~2.85 (m波段和4.19~4.48 (m波段的辐射强度进行数值计算，分析了影响火点像元辐射特性的因素。通过与Titan ⅢB型火箭尾焰辐射特性进行对比分析并利用实际火点数据验证了亚像元火点的辐射干扰特性，结果表明:亚像元火点在2.55~2.85 (m波段和4.19~4.48 (m波段均能够对红外预警卫星的探测造成辐射干扰，与火箭尾焰辐射特性的区别是大部分火点像元在4.19~4.48 (m波段具有更强的辐射强度，结果可为提升红外预警卫星抗火点辐射干扰能力提供理论支撑。

Radiation Interference Characteristics of Sub-pixel Fire Points on Infrared Early Warning Satellite

The sub-pixel fire point is the radiation interference source of the infrared early warning satellite(IEWS).Based on the derivation of the radiation intensity equation of the fire pixel,the radiation intensity of fire point pixels in the 2.55-2.85mm and 4.19-4.48mm wavebands under different conditions are numerically calculated,and the factors affecting the radiation characteristics of the fire pixel are analyzed.We compared and analyzed the radiation characteristics of the tail flame of the Titan IIIB rocket andverifiedthe actual fire data.The results showed that the sub-pixel fire points in 2.55-2.85mm and 4.19-4.48mm wavebands can cause radiant interference to IEWS.Moreover,the radiation characteristics of the rocket tail flames were different in that most fire pixels showed stronger radiation intensities in the 4.19-4.48mm waveband.The results can provide theoretical support for improving the ability of IEWS to resist the interference of fire-point radiation.