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http://dx.doi.org/10.7780/kjrs.2021.37.2.13

GEO-KOMPSAT-2A AMI Best Detector Select Map Evaluation and Update  

Jin, Kyoungwook (Image Data System Development Division, Korea Aerospace Research Institute)
Lee, Sang-Cherl (Mission Operation and Infrastructure Service Division, Korea Aerospace Research Institute)
Lee, Jung-Hyun (Mission Operation and Infrastructure Service Division, Korea Aerospace Research Institute)
Publication Information
Korean Journal of Remote Sensing / v.37, no.2, 2021 , pp. 359-365 More about this Journal
Abstract
GEO-KOMPSAT-2A (GK2A) AMI (Advanced Meteorological Imager) Best Detector Select (BDS) map is pre-determined and uploaded before the satellite launch. After the launch, there is some possibility of a detector performance change driven by an abrupt temperature variation and thus the status of BDS map needs to be evaluated and updated if necessary. To investigate performance of entire elements of the detectors, AMI BDS analyses were conducted based on a technical note provided from the AMI vendor (L3HARRIS). The concept of the BDS analysis is to investigate the stability of signals from detectors while they are staring at targets (deep space and internal calibration target). For this purpose, Long Time Series (LTS) and Output Voltage vs. Bias Voltage (V-V) methods are used. The LTS for 30 secs and the V-V for two secs are spanned respectively for looking at the targets to compute noise components of detectors. To get the necessary data sets, these activities were conducted during the In-Orbit Test (IOT) period since a normal operation of AMI is stopped and special mission plans are commanded. With collected data sets during the GK2A IOT, AMI BDS map was intensively examined. It was found that about 1% of entire detector elements, which were evaluated at the ground test, showed characteristic changes and those degraded elements are replaced by alternative best ones. The stripping effects on AMI raw images due to the BDS problem were clearly removed when the new BDS map was applied.
Keywords
AMI; BDS; GEO-KOMPSAT-2A;
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