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静止轨道卫星红外探测大气透过率与蒙气差分析
引用本文:王成良,胡胜敏,饶鹏.静止轨道卫星红外探测大气透过率与蒙气差分析[J].光学与光电技术,2013,11(4):33-36.
作者姓名:王成良  胡胜敏  饶鹏
作者单位:1. 空军预警学院,湖北武汉,430019
2. 上海技术物理研究所中国科学院红外探测与成像技术重点实验室,上海,200083
基金项目:空军预警学院科研创新基金,中国科学院红外探测与成像技术重点实验室开放基金
摘    要:静止轨道卫星采用CO2和水汽吸收波段进行红外探测,探测性能受观测波段的大气透过率影响显著,同时,大气折射率随空间位置的变化影响目标的定位精度。通过建立大气中探测路径几何模型,利用FASCODE软件计算出路径上2.7μm和4.3μm波段大气透过率和蒙气差并制成图表,蒙气差计算结果与理论估算一致。结果表明,2.7μm波段大气透过率在5~25km高度变化显著,35km以上透过率达95%;4.3μm波段大气透过率在5~45km高度变化显著,50km以上透过率达95%。两个波段的蒙气差相同,对目标位置的影响较少,天顶角8°以内,影响只有50m量级,超过8°,偏差随角度增长很快,到地球圆盘边缘时达到1km。通过插值,透过率数据和蒙气差数据可用于系统设计、性能评估和实时仿真。

关 键 词:大气透过率  蒙气差  红外  探测  静止轨道

Analysis of Atmospheric Transmittance and Refraction on Geostationary Satellite-Based Infrared Detection
WANG Cheng-liang,HU Sheng-min,RAO Peng.Analysis of Atmospheric Transmittance and Refraction on Geostationary Satellite-Based Infrared Detection[J].optics&optoelectronic technology,2013,11(4):33-36.
Authors:WANG Cheng-liang  HU Sheng-min  RAO Peng
Institution:1 Air Force Early-Warning Academy, Wuhan 430019, China 2 Shanghai Institute of Technical Physics of the Chinese Academy of Sciences, Infrared Detection and Imaging Technology Key Laboratory of the Chinese Academy of Sciences, Shanghai 200083, China)
Abstract:Detection performance of geostationary satellites is significantly affected by the atmospheric transmittance with the absorption infrared bands of CO2 and water vapor. Positioning accuracy of the target is also affected by the atmospheric re- fraction. By the geometry model of the atmospheric sounding path and FASCODE software, atmospheric transmittance and refraction are formed on the two bands with tables. The result of refraction is consistent with the theoretical estimates. As for the 2. 7/~m band, atmospheric transmittance changes significantly with height of 5~25 km, and reaches 950/00 over 35 km, for 4. 3 /~m band, it changes significantly with height of 5--45 km, and reaches 95% over 50 kn~ The refraction of the two bands is same. The deviation of the target location is only 50 meters orders when zenith angle is less than 8 degrees, but increased rapidly with the angle more than 8 degrees, and up to lkm at the edge of the earth disc. By interpolation, the transmittance and refraction data can be used for system design, performance evaluation and real-time simulation.
Keywords:atmospheric transmittance  atmospheric refraction  infrared  detection  geostationary orbit
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