9 November 2012 Onboard calibration status of the ASTER instrument
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Abstract
The ASTER Instrument is one of the five sensors on the NASA’s Terra satellite on orbit since December 1999. ASTER consists of three radiometers, VNIR, SWIR and TIR whose spatial resolutions are 15 m, 30 m and 90 m, respectively. Unfortunately SWIR stopped taking images since May 2008 due to the offset rise caused by the detector temperature rise, but VNIR and TIR are taking Earth images of good quality. VNIR and TIR experienced responsivity degradation while SWIR showed little change. Band 1 (0.56 μm) decreased most among three VNIR bands and 30 % in twelve years. Band 12 (9.1 μm) decreased 40 % and most among five TIR bands. There are some discussions of the causes of the responsivity degradation of VNIR and TIR. Possible causes are contamination accretion by silicone outgas, thruster plume and plasma interaction. We marked hydrazine which comes out unburned in the thruster plume during the inclination adjust maneuver (IAM). Hydrazine has the absorption spectra corresponding to the TIR responsivity degradation in the infrared region. We studied the IAM effect on the ASTER by allocating the additional onboard calibration activities just before and after the IAM while the normal onboard calibration activity is operated once in 49 days. This experiment was carried out three times in fiscal year 2011.
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Fumihiro Sakuma, Fumihiro Sakuma, Masakuni Kikuchi, Masakuni Kikuchi, Hitomi Inada, Hitomi Inada, Shigeki Akagi, Shigeki Akagi, Hidehiko Ono, Hidehiko Ono, } "Onboard calibration status of the ASTER instrument", Proc. SPIE 8528, Earth Observing Missions and Sensors: Development, Implementation, and Characterization II, 85280W (9 November 2012); doi: 10.1117/12.976012; https://doi.org/10.1117/12.976012
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