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KARI is currently operating GEO-KOMPSAT-1, which is Korea's first geostationary communications, ocean, and meteorological satellite. KARI is also in the process of developing the follow-up geostationary orbit multifunctional satellites GEO-KOMPSAT-2A and GEO-KOMPSAT-2B.
Geostationary satellites are designed to circle the earth at 11,000km/hour, which is the same speed as the rotational velocity of the earth at 36,000km above the equator. As it can view a specific broad region of the earth at all times, it is generally used for weather monitoring as well as communications and broadcasting.
01Cheollian 2B, the Geostationary Multipurpose Satellite
The geostationary satellite can observe the generation, migration, and extinction of environmental pollutants such as fine dust and yellow dust and the marine conditions around the Korean Peninsula.
It revolves in the same direction as the earth's rotation, so it can aim at the Korean Peninsula at all times to monitor the marine and environmental conditions continuously. Cheollian 2B is the world’s first satellite equipped with an environmental payload to observe the air pollutants.
Moreover, Cheollian 2B has a built-in marine payload with four times' higher resolution and more observation channels (8 -> 13) than Cheollian 1. It enables the systematic management and use of marine territory by precisely monitoring the marine environments such as marine dumping areas and tsunami areas.
02Cheollian 2A, the Geostationary Multipurpose Satellite
The satellite observes the ground and space meteorological conditions following the mission of Geostationary Multipurpose Satellite No. 1. Cheollian 2A has four times the spatial resolution of Cheollian 1. Moreover, Cheollian 2A requires only 10 minutes to observe the entire sphere and 2 minutes to observe the Korean Peninsula compared to the 3 hours and 15 minutes required by Cheollian 1 to observe the whole sphere and the Korean Peninsula, respectively, which means 18 times' faster observation. Therefore, it can detect local flooding at least two hours earlier than the previous satellite.
Cheollian 2A has 16 channels (4 visible, 2 near IR, and 10 IR) compared to 5 channels (1 visible and 4 IR) of Cheollian 1; thus, the serviced weather data increased by more than three times from 16 to 52. Moreover, the built-in space meteorological payload has enabled the study of the impact of the physical change of space on the geostationary satellite and meteorological condition and practical life on earth.
03Cheollian 1, the Communication and Marine Meteorological Satellite
Korea’s first geostationary satellite has the payload for communication, marine, and meteorological functions by observing the weather and marine condition around the Korean Peninsula 24 hours a day and provides satellite communication test service.
It protects the safety and lives of the people observing the Korean Peninsula every 15 minutes usually and every 8 minutes during an emergency such as typhoon. It also monitors the marine environment in a 2,500 ㎞ × 2,500 ㎞ area around the Korean Peninsula in real time. The world's 10th communication satellite is part of the next-generation satellite information and communication system by providing satellite communication, broadcasting, geographical information, and transportation information.
KARI advanced the low orbital satellite development technology to the geostationary satellite development technology and laid the groundwork for developing the geostationary satellite independently through the development of Cheollian 1.