Infrared and Laser Engineering, Volume. 52, Issue 4, 20220644(2023)
On-board calibration and verification of GF5B thermal infrared channel
Figures & Tables(16)
Fig. 1. Absolute radiometric calibration process of thermal infrared on-board blackbody
Fig. 6. High and low temperature blackbody image data after relative radiation correction
Fig. 11. Satellite image and satellite-to-ground verification area
Table 1. Average DN of imager channel
View tableView in ArticleTable 1. Average DN of imager channel
Blackbody Average DN B11 B12 High temperature blackbody 1 271.613 683 1 328.266 478 Low temperature blackbody 987.581 657 0 1076.938 745
Table 2. Equivalent spectral radiance of imager channel
View tableView in ArticleTable 2. Equivalent spectral radiance of imager channel
Blackbody Equivalent spectral radiance/W·m−2·sr−1·μm−1 B11 B12 High temperature blackbody 9.630290 8.977463 Low temperature blackbody 6.873348 6.605330
Table 3. Calibration coefficient of imager channel
View tableView in ArticleTable 3. Calibration coefficient of imager channel
Calibration coefficient B11 B12 Ks 0.010 475 0.010 154 Cs −3.687 025 −4.552 373
Table 4. Accuracy analysis of on-board blackbody calibration
View tableView in ArticleTable 4. Accuracy analysis of on-board blackbody calibration
Number Error source Error σ1 Absolute calibration of ground vacuum radiation 1.159% σ2 Blackbody calibration on-board 0.410% σ3 Blackbody temperature uniformity 0.310% σ4 Blackbody stability 0.027% Total error 1.268%
Table 5. Comparison of radiance and channel brightness temperature from different data sources
View tableView in ArticleTable 5. Comparison of radiance and channel brightness temperature from different data sources
Data source Radiance/ W·m−2·sr−1·μm−1 Brightness temperature/K B11 B12 B11 B12 Satellite data 6.22 5.91 273.78 272.58 Yantai buoy data 6.18 5.99 273.45 273.35
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Xiuxiu Ma, Haiyan Wang, Qijin Han, Xuewen Zhang, Hang Zhao, Zhaopeng Xu, Jian Zeng, Lingling Ma, Ning Wang. On-board calibration and verification of GF5B thermal infrared channel[J]. Infrared and Laser Engineering, 2023, 52(4): 20220644
Paper Information
Category: Infrared technology and application
Received: Jan. 25, 2023
Accepted: --
Published Online: Jul. 4, 2023
The Author Email: Wang Haiyan (hlwwhy@qq.com)
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