On-Orbit Performance Evaluation of On-Board Calibration Component of GF-5 Visible and Infrared Multispectral Imager

Wenxin Huang; Liming Zhang; Xiaolong Si; Heyu Xu; Hongyao Chen; Xin Li; Yanhua Zhao

doi:10.3788/AOS202040.2029001

Journals >Acta Optica Sinica >Volume 40 >Issue 20 >Page 2029001 > Article

Acta Optica Sinica
Vol. 40, Issue 20, 2029001 (2020)

On-Orbit Performance Evaluation of On-Board Calibration Component of GF-5 Visible and Infrared Multispectral Imager

Wenxin Huang^1、*, Liming Zhang¹, Xiaolong Si¹, Heyu Xu¹, Hongyao Chen¹, Xin Li¹, and Yanhua Zhao²

Author Affiliations

¹Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei, Anhui 230031, China

²Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China;

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DOI: 10.3788/AOS202040.2029001 Cite this Article Set citation alerts

Wenxin Huang, Liming Zhang, Xiaolong Si, Heyu Xu, Hongyao Chen, Xin Li, Yanhua Zhao. On-Orbit Performance Evaluation of On-Board Calibration Component of GF-5 Visible and Infrared Multispectral Imager[J]. Acta Optica Sinica, 2020, 40(20): 2029001 Copy Citation Text

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Fig. 1. On-board calibration process on VIMI

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Fig. 2. Working schematic diagram of SDRDM

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Fig. 3. Change curve of SDRDM solar observation port signal with azimuth

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Fig. 4. H factor change curve with time and azimuth

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Fig. 5. H factor curve after correction for B₃ and B₅ bands

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Date\|Azimuth /(°)	B₁	B₃	B_r	B₅
2018/8/28\|157.739	1	1	1	1
2019/4/16\|158.967	0.9961	0.9899	0.9917	0.9905
2019/5/16\|161.206	1.0076	0.9926	0.9932	0.9926
2019/8/28\|159.846	1.0073	0.9984	1.0020	1.0025
2020/3/17\|159.415	1.0046	1.0016	1.0050	1.0076
Average	0.0049	0.0050	0.0058	0.0071

Table 1. H factor under the angle of similar azimuth

Source	Uncertainty /%
Relative SD BRDF measurement (μ₁)	0.50
Relative SD cosine error of incidence (μ₂)	0.54
Relationship between transmittance distribution and incident angle (μ₃)	0.35
Stability of SDRDM (μ₄)	0.10
Stray light (μ₅)	0.27
Total uncertainty (U)	0.86

Table 2. Uncertainty of SDRDM monitoring measurement

Source	Uncertainty /%
SD BRDF measurement (μ₁)	1
SD cosine error of incidence (μ₂)	0.54
SD radiance non-uniformity (μ₃)	0.90
Earth-sun distance correction factor (μ₄)	0.20
SD stability monitor (μ₅)	0.86
Measurement of SD H factor before launch (μ₆)	0.50
Solar spectral irradiance (μ₇)	1
Stray light (μ₈)	2.72
Total uncertainty (U)	3.40

Table 3. Uncertainty of the SD on-board emitted spectrum radiance

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