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Aki Sato

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Proceedings Article | 11 June 2021 Open Access

The development and on-orbit calibration status of GOSAT-2 TANSO-CAI-2 instrument

Takeru Uno, Toshiharu Oishi, Yasutaka Fujii, Masao Imaki, Aki Sato, Fumie Kataoka, Hiroko Imai, Makiko Hashimoto, Kei Shiomi, Masakatsu Nakajima

Proceedings Volume 11852, 1185257 (2021) https://doi.org/10.1117/12.2599936

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TANSO-CAI-2 onboard GOSAT-2 satellite is a multi-spectral imager for the observation of cloud and aerosol. The CAI- 2 has 10 observation bands with 7 different wavelengths, which cover 340-1630 nm. The wavelength width of each band is less than 13 nm in the UV to NIR band and less than 73 nm in the SWIR band. From Feb. 2019, the evaluation of the initial calibration phase was carried out to calibrate the geometric and radiometric characteristics. Following the initial calibration phase, the evaluation of radiometric performance has been continuously conducted. The evaluation of dark level and dark noise has shown almost stable results, although there is some variation. The radiometric response evaluation using the lunar calibration data and the ROLO model showed a degradation in the UV Bands, especially in Band 1 (340 nm), which showed a degradation of about 8% in the two years relative to Band 4 (865 nm). No obvious response degradation was observed for the other bands. Those results suggest that the radiometric performance of the CAI-2 is almost maintained for two years since the initial calibration phase.

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