Dr. Tae-Hyeong Oh Profile

Dr. Tae-Hyeong Oh

at Korea Meteorological Administration

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Proceedings Article | 6 October 2023 Presentation

Straylight rejection of ABI, AHI, and AMI

Hui Xu, Xiangqian Wu, Fangfang Yu, Arata Okuyama, Jiyoung Kim, Tae-Hyeong Oh

Proceedings Volume 12685, 126850G (2023) https://doi.org/10.1117/12.2679484

KEYWORDS: Satellites, Satellite imaging, Meteorological satellites, Equipment, Imaging systems, Stray light, Manufacturing, Infrared imaging, Contamination, Sun

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Stray light rejection around local midnight during eclipse season is a unique challenge for satellite instrument on geostationary orbit, especially for a 3-axis stabilized platform such as the Advanced Baseline Imager (ABI) on the U. S. Geostationary Operational Environmental Satellite (GOES-16/17/18), the Advanced Himawari Imager (AHI) on Japan’s Himawari-8/9 satellites, and the Advanced Meteorological Imager (AMI) on Korea’s GEO-KOMPSAT-2A satellite. In this study, we use the data collected in fall 2022 to compare the straylight rejection performance for the infrared (IR) channels of these instruments, all built by the same manufacture. Since straylight contamination is most pronounced in the 3.7 µm channel, the straylight magnitude in this channel is estimated for the six instruments and compared with each other. The results show that the three ABIs met the requirements, with GOES-17 slightly worse than GOES-16 and GOES-18 noticeably better than GOES-16/17. Both Himawari-8/9 AHIs are subject to serious stray light contamination, including the bands of straylight far away from the Sun that is due to the “sneak path”. Launched in October 2014, Himawari-8 is the first satellite with ABI-type instrument. Thanks to Japan Meteorological Agency (JMA) who shared early AHI-8 results with NOAA, the manufacture was able to improve the straylight rejection for the following flight modules, which proves to be successful. The AMI data is currently being processed; the results will be reported to the conference.

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