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- W4362653553 abstract "Satellite Calibration Spectrometer (SCS) onboard HY-1C/HY-1D could support a direct calibration using the Simultaneous Nadir Overpass (SNO) approach for imaging spectroradiometers with various band configurations on the same or different satellite platforms by providing precise hyperspectral radiance after onboard calibration employing a solar diffuser (SD). However, a unique phenomenon was discovered in the analysis of annual variations of onboard calibration coefficients of the SCS. Although the solar calibration scheme employing an SD was used, a season-dependent oscillation still existed, and the oscillation trend of calibration coefficients is highly correlated with the variation trend of solar beta angle. In this article, we analyzed the entire solar calibration results of SCS from HY-1C using more than three years of data and discovered that season-dependent oscillation is primarily due to the variations in the transmittance of the solar attenuation screen affected by satellite platform attitude. Furthermore, an accurate variation model of the incident angle on the solar attenuation screen was developed, and the findings demonstrate that the season-dependent oscillation of onboard calibration coefficients of SCS could be effectively removed. Finally, the model established in this article is validated by optical simulation, which shows its consistency and reliability." @default.
- W4362653553 created "2023-04-07" @default.
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- W4362653553 date "2023-01-01" @default.
- W4362653553 modified "2023-09-23" @default.
- W4362653553 title "Correction of the Residual Effect from Solar Beta Angle for Onboard Calibration of Satellite Calibration Spectrometer" @default.
- W4362653553 doi "https://doi.org/10.1109/tgrs.2023.3264546" @default.
- W4362653553 hasPublicationYear "2023" @default.
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