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1. 中国科学院 长春光学精密机械与物理研究所,吉林 长春,130033
2. 中国科学院 研究生院 北京,100039
3. 中国气象局 国家卫星气象中心, 北京 100081
纸质出版日期:2010-9-21,
网络出版日期:2010-9-21,
收稿日期:2010-5-5,
修回日期:2010-8-24,
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杨东军, 方 伟, 邱 红, 齐 瑾. 太阳辐射的在轨监测和定标[J]. 发光学报, 2010,31(5): 676-681
YANG Dong-jun, FANG Wei, QIU Hong, QI Jin. On-orbit Data Calibration of FY-3A Solar Irradiance Monitor[J]. 发光学报, 2010,31(5): 676-681
采用宽视场设计
逐轨扫描太阳式测量方式的FY-3A太阳辐射监测仪
结合在轨一年半的太阳辐照度观测数据和地面实验与理论分析
研究了影响定标精度的因素
给出了修正方程和曲线
并通过与世界 辐射基准(WRR)的地面外场定标实验
得到了FY-3A上的三台绝对辐射计的比例系数
R
1
=1.0083
R
2
=1.0066
和
R
3
=1.0065
。日地距离的理论分析和实际太阳辐照度测量曲线均证明:地球近日点太阳辐照度值最大
远日点太阳辐照度值最小
且在3.34%范围内随日期变化。利用天文公式
结合遥感源包中的准确测量时间
给出了日、地修正系数。另外
分析了冷空间背景辐射对定标精度的影响
给出了冷空间辐射值的计算公式
并结合宽视场设计和扫描式测量的特点
重点分析了采光结束时刻和刚捕获太阳光时刻入射角的差异给辐照度测量带来的影响
通过几何关系给出了入射角修正系数方程及修正曲线。最后
综合各定标修正系数
给出了在轨定标方程和定标曲线
并分析了定标精度。
The solar irradiance monitor (SIM)
a payload on the FY-3A satellite
is mainly used to monitor the change of solar irradiance. The SIM with wide angle of viewing field scans the sun every orbit. This kind design simplifies the system structure
but makes the on-orbit calibration more difficult. Based on the data obtained by SIM in more than one year
we study the factors that affect the calibration precision experimentally and theoretically
giving the equation and curve. First
by the ground-calibration experiment comparing with the World Radiometric Reference (WRR)
we get the scale factors of the three radiometers
R
1
=1.0083
R
2
=1.0066
and
R
3
=1.0065. Then
by the theoretical analysis of distance between sun and earth and the data curve of the solar irradiance measured
it is proved that the max solar irradiance is at perihelion (3 January) and the min solar irradiance is at aphelion(3 July)
and the solar irradiance changes at the range of 3.34% with the time variant. Using the astronomical formula and based on the correct time in the remote packages
gets the distance correction factor between sun and earth. It is obvious that the distance between sun and earth affects the calibration precision. In addition
analyzing the affection of the space background on the calibration precision and gets the calibration formula of the space irradiance. Furthermore
combining the characteristics of the wide field of view and the measurement method of step-scanning sun
the effects of the difference from incidence angle between just and over capturing sunlight on the solar irradiation measurement are mainly analysed
geting the the formula of the correction factor and curve with analysing the geometric parameters.Finally analyzing all of correction factors
the on-orbit calibration formula and curve are given.
太阳辐射监测入射角在轨定标
solar irradiance monitorincidence angleon-orbit calibration
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. Chin. J. Lumin. (发光学报), 2007, 28 (5):748-753 (in Chinese).
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. Solar Physics, 2005, 230 (1-2):91-109.
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