3 October 2006 Onboard calibration status of ASTER
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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 TIR has one on-board blackbody and is unable to see the dark space. Therefore the temperature of the on-board blackbody of the TIR 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.
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Fumihiro Sakuma, Fumihiro Sakuma, Takashi Sato, Takashi Sato, Hitomi Inada, Hitomi Inada, Shigeki Akagi, Shigeki Akagi, Hidehiko Ono, Hidehiko Ono, } "Onboard calibration status of ASTER", Proc. SPIE 6361, Sensors, Systems, and Next-Generation Satellites X, 63610W (3 October 2006); doi: 10.1117/12.687750; https://doi.org/10.1117/12.687750
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