Radiation Interference Characteristics of Sub-pixel Fire Points on Infrared Early Warning Satellite
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摘要: 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。Abstract: 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 2.55-2.85 (m and 4.19-4.48 (m 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 2.55-2.85 (m and 4.19-4.48 (m 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 4.19-4.48 (m waveband. The results can provide theoretical support for improving the ability of IEWS to resist the interference of fire-point radiation.
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Keywords:
- infrared early warning satellite /
- radiation interference /
- fire pixel /
- tail flame
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图 2 卫星天顶角与探测器像元对应的地表分辨率关系
Figure 2. The relationship between the satellite zenith angle and the surface resolution of the detector
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图 3 卫星天顶角与路径大气平均透过率的关系
Figure 3. The relationship between satellite zenith angle and path average atmospheric transmittance
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图 4 不同火点像元参数对辐射强度的影响
Figure 4. Effect of different parameter changes on radiant intensity of fire pixel
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图 5 Titan ⅢB型火箭尾焰在飞行高度18km、观测角为48°时的辐射强度
Figure 5. Spectra of Titan ⅢB rocket tail flame at 18 km and viewing aspect of 48°
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图 6 与Titan ⅢB型火箭尾焰辐射强度相同的火点温度和火点面积曲线
Figure 6. Critical temperature and area of surface fire point equal to radiant intensity of Titan ⅢB rocket tail flame
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图 7 探测器覆盖范围内的火点分布及火点参数统计
Figure 7. Fire distribution and fire parameter statistics within the coverage of the detector
表 1 火点像元参数的参考值与范围
Tt/K Tb/K St/km2 θs/° θz/° Value 800 300 0.1 30 30 Range 400-1600 280-320 0.01-1 0-80 0-80 
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表 2 火点像元辐射强度统计
Table 2 Statistics of fire pixel radiation intensity
Wavebands/μm Minimum/W·sr-1 Maximum/W·sr-1 Average/W·sr-1 Median/W·sr-1 2.55-2.85 2.771×102 6.197×106 2.456×104 7.014×103 4.19-4.48 3.412×103 5.576×106 7.449×104 4.351×104
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