The impacts of temperature and emissivity estimations on radiance-based calibration for HJ-1B/IRS TIR band
The impacts of temperature and emissivity estimations on radiance-based calibration for HJ-1B/IRS TIR band
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温度和发射率估计对 HJ-1B/IRS TIR 波段基于辐射率校准的影响
DOI：
10.1016/j.ijleo.2014.02.037
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发表时间：
2014-08
期刊：
影响因子：
3.1
通讯作者：
Wang, Dong
中科院分区：
文献类型：
--
作者：
Zhao, LiMin;Xie, Yong;Gong, Hui;Wang, Dong
环境一号星座环境一号B星上的IRS辐射计在热红外波段只有一个宽波段（IRSB 08），波段范围在10 ~ 12 μm之间。针对IRS B 08缺乏深空观测的特点，采用周期性加热定标系统黑体的方法，实现了IRS B 08星上辐射定标。在两点定标方法中，采用基于辐射的替代定标作为一点，以替代NTS的不稳定性。通过定义波段匹配因子k，分析了温度和发射率对估计的影响。结果表明，它们的影响与参考波段和目标波段的通道中心波长有关。对于CE 312 B 02参考波段，±10 K的温度估计误差对IRS B 08 TOA辐射亮度的影响可以忽略，而6种替代发射率的影响也可以忽略。但若以CE 312 B 03或B 04为参考波段，即使以淡水、海水和黑体的发射率样品为实际表面，其影响也不容忽视。将目标带周围的两个参考带（如CE 312 B 03和B 04至IRS B 08）线性组合，将使用单个参考带的校准不确定度从1.8 K和2.5 K显著降低到0.4 K。基于CE 312 B 02的替代定标精度为0.25 K，替代定标系数可在2009年8月至2010年8月期间使用。
The IRS radiometer on the HJ-1B satellite of HJ-1 constellation has just a wide band (IRS B08) in thermal infrared spectral region between 10 and 12 μm. The onboard radiometric calibration of IRS B08 is implemented by periodically heating the blackbody of calibration system from normal temperature status (NTS) to high temperature status (HTS) for the lack of observation to deep space. Radiance-based vicarious calibration was taken as one point in two-point calibration method to substitute NTS for the instability of NTS. The estimation impacts of temperature and emissivity were analyzed by defining band matching factork. The results indicate that their impacts were related to channel center wavelengths of reference and target bands. As to the reference band of CE312 B02, temperature impact of ±10 K estimated error on IRS B08 TOA radiance can be ignored while six substituted emissivities demonstrated their impacts can also be ignored. However, if CE312 B03 or B04 was taken as reference bands, the impacts cannot be ignored even emissivity-specimens of fresh water, sea water and blackbody were used as actual surface. Linear combination of two reference bands surrounding target band, such as CE312 B03 and B04 to IRS B08, significantly reduced the calibration uncertainty of using single reference band from 1.8 K and 2.5 K to 0.4 K. The vicarious calibration accuracy based on CE312 B02 is 0.25 K and the vicarious calibration coefficients could be used from August 2009 to August 2010.
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影响因子：
2.2
作者：
T. Anderson;D. Covert;S. F. Marshall;M. L. Laucks;R. Charlson;A. Waggoner;J. Ogren;R. Caldow;R. L. Holm;F. R. Quant;G. Sem;A. Wiedensohler;N. Ahlquist;T. Bates
通讯作者：
T. Anderson;D. Covert;S. F. Marshall;M. L. Laucks;R. Charlson;A. Waggoner;J. Ogren;R. Caldow;R. L. Holm;F. R. Quant;G. Sem;A. Wiedensohler;N. Ahlquist;T. Bates
DOI：
10.1007/s11431-012-4819-4
发表时间：
2012-04
期刊：
Science China Technological Sciences
影响因子：
--
作者：
Jiaguo Li;Xingfa Gu;Tao Yu;Xiaoying Li;Hailiang Gao;Li Liu;Hui Xu
通讯作者：
Jiaguo Li;Xingfa Gu;Tao Yu;Xiaoying Li;Hailiang Gao;Li Liu;Hui Xu
DOI：
--
发表时间：
1987-07
期刊：
--
影响因子：
--
作者：
A. Berk;L. Bernstein;D. Robertson
通讯作者：
A. Berk;L. Bernstein;D. Robertson
影响因子：
2.6
作者：
J. Barsi;J. Schott;F. Palluconi;D. Helder;S. Hook;B. Markham;G. Chander;E. O'Donnell
通讯作者：
J. Barsi;J. Schott;F. Palluconi;D. Helder;S. Hook;B. Markham;G. Chander;E. O'Donnell
影响因子：
3.4
作者：
M. Lefèvre;Olivier Bauer;Axel Iehlé;L. Wald
通讯作者：
M. Lefèvre;Olivier Bauer;Axel Iehlé;L. Wald