Pre-Launch Calibration of the Bidirectional Reflectance Distribution Function (BRDF) of Ultraviolet-Visible Hyperspectral Sensor Diffusers
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Published:2024-08-19
Issue:16
Volume:14
Page:7278
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ISSN:2076-3417
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Container-title:Applied Sciences
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language:en
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Short-container-title:Applied Sciences
Author:
Mao Jinghua123ORCID, Wang Yongmei1234ORCID, Shi Entao123, Wang Jinduo5, Yao Shun6, Zhu Jun6
Affiliation:
1. Laboratory of Space Environment Exploration, National Space Science Center, Beijing 100190, China 2. Beijing Key Laboratory of Space Environment Exploration, Beijing 100190, China 3. Key Laboratory of Environmental Space Situation Awareness Technology, Beijing 100190, China 4. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China 5. National Key Laboratory of Scattering and Radiation, Beijing 100854, China 6. DFH Satellite Co., Ltd., Beijing 100081, China
Abstract
An Ultraviolet-Visible Hyperspectral Sensors (UVS) instrument is an ultraviolet-visible imaging spectrograph equipped with two-dimensional charge-coupled device detectors. It records both the spectrum and the swath perpendicular to the flight direction, offering a wide 112° swath. This configuration enables global daily ground coverage with high spatial resolution. The absolute values of in-orbit solar irradiance can be evaluated using the bidirectional reflectance distribution function (BRDF), with the measurement accuracy directly affecting the accuracy of constituent inversion. This paper outlines the calibration process for the BRDF of the UVS, detailing the calibration methods and equipment used. It also proposes a BRDF model and discusses key coefficients. The accuracy levels of the UVS in the UV1, UV2, and VIS channels were 2.162%, 2.162%, and 2.173%, respectively.
Funder
Civil Space Program
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