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| Titel |
Introduction of the in-orbit test and its performance for the first meteorological imager of the Communication, Ocean, and Meteorological Satellite |
| VerfasserIn |
D. H. Kim, M. H. Ahn |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 8 ; Nr. 7, no. 8 (2014-08-12), S.2471-2485 |
| Datensatznummer |
250115869
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| Publikation (Nr.) |
 copernicus.org/amt-7-2471-2014.pdf |
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| Zusammenfassung |
The first geostationary Earth observation satellite of Korea – the
Communication, Ocean, and Meteorological Satellite (COMS) – was successfully
launched on 27 June 2010. After arrival at its operational orbit, the
satellite underwent an in-orbit test (IOT) that lasted for about 8 months. During
the IOT period, the main payload for the weather application, the meteorological
imager, went through successful tests for demonstrating its function and performance, and the test results are introduced here.
The radiometric performance of the meteorological imager (MI) is tested by means of signal-to-noise ratio (SNR)
for the visible channel, noise-equivalent differential temperature (NEdT) for
the infrared channels, and pixel-to-pixel nonuniformity for both the visible and
infrared channels. In the case of the visible channel, the SNR of all eight
detectors is obtained using the ground-measured parameters with the
background signals obtained in orbit. The overall performance shows a value
larger than 26 at 5% albedo, exceeding the user requirement of 10 by a
significant margin. Also, the relative variability of detector responsivity
among the eight visible channels meets the user requirement, showing values
within 10% of the user requirement. For the infrared channels, the NEdT
of each detector is well within the user requirement and is comparable with
or better than the legacy instruments, except for the water vapor channel, which
is slightly noisier than the legacy instruments. The variability of detector
responsivity of infrared channels is also below the user requirement, within
40% of the requirement, except for the shortwave infrared channel. The improved
performance result is partly due to the stable and low detector temperature
obtained due to spacecraft design, i.e., by installing a single solar panel
on the opposite side of the MI. |
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