9 October 2008 ASTER on-board calibration status
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Abstract
The ASTER is a high-resolution optical sensor for observing the Earth on the Terra satellite launched in 1999. The ASTER consists of three radiometers, the VNIR in the visible and near-infrared region, the SWIR in the shortwave infrared region, and the TIR in the thermal infrared region. The on-board calibration devices of the VNIR and the SWIR were two halogen lamps and photodiode monitors. In orbit three bands of the VNIR showed a rapid decrease in the output signal while all SWIR bands remained stable. The temperature of TIR on-board blackbody remains at 270 K in the short-term calibration for the offset calibration, and is varied from 270 K to 340 K in the long term calibration for the offset and gain calibration. The long term calibration showed a decrease of the TIR response in orbit. The radiometric calibration coefficients of the VNIR and the TIR were fit to smooth functions. The temperature of the SWIR detector increased from 77 K to more than 93 K in May 2008 so that the SWIR data saturated thereafter.
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Fumihiro Sakuma, Fumihiro Sakuma, Takashi Sato, Takashi Sato, Hitomi Inada, Hitomi Inada, Shigeki Akagi, Shigeki Akagi, Hidehiko Ono, Hidehiko Ono, } "ASTER on-board calibration status", Proc. SPIE 7106, Sensors, Systems, and Next-Generation Satellites XII, 71060G (9 October 2008); doi: 10.1117/12.800127; https://doi.org/10.1117/12.800127
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