Onboard calibration of the ASTER instrument over twelve years

Fumihiro Sakuma; Masakuni Kikuchi; Hitomi Inada; Shigeki Akagi; Hidehiko Ono

doi:10.1117/12.970619

19 November 2012 Onboard calibration of the ASTER instrument over twelve years

Fumihiro Sakuma, Masakuni Kikuchi, Hitomi Inada, Shigeki Akagi, Hidehiko Ono

Proceedings Volume 8533, Sensors, Systems, and Next-Generation Satellites XVI; 853305 (2012) https://doi.org/10.1117/12.970619
Event: SPIE Remote Sensing, 2012, Edinburgh, United Kingdom

Abstract

The ASTER is a high-resolution optical sensor for observing the Earth on the Terra satellite launched in December1999. The ASTER consists of three radiometers. The VNIR has three bands in the visible and near-infrared region, the SWIR has six bands in the shortwave infrared region, and the TIR has five bands in the thermal infrared region. The onboard calibration devices of the VNIR and SWIR were halogen lamps and photodiode monitors. In orbit three bands of the VNIR showed a rapid decrease in the output signal. The band 1, the shortest wavelength, decreased most to 70% in twelve years. The temperature of the onboard blackbody of the TIR is varied from 270 K to 340 K in the long term calibration for the offset and gain calibration. The long term calibration of the TIR showed a decrease in response after launch. The decrease was most remarkable at band 12 decreasing to 60% in eleven years. The degradation spectra of the TIR shows that the possible causes of the degradation might be silicone and hydrazine. ASTER onboard calibration is normally carried out once in 49 days but additional onboard calibrations were added just before and after the inclination adjustment maneuver (IAM) to check the effect on the RCC. This experiment was carried out three times for each IAM in the fiscal year 2011. The result showed that the change in the RCC was small for both VNIR and TIR.

Citation Download Citation

Fumihiro Sakuma, Masakuni Kikuchi, Hitomi Inada, Shigeki Akagi, and Hidehiko Ono "Onboard calibration of the ASTER instrument over twelve years", Proc. SPIE 8533, Sensors, Systems, and Next-Generation Satellites XVI, 853305 (19 November 2012); https://doi.org/10.1117/12.970619

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