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Geostationary Earth Orbit (GEO) Satellite

Geostationary Earth Orbit (GEO) Satellite

Geostationary Earth Orbit (GEO) Satellite [image]

KARI is operating COMS(Communication, Ocean, and Meteorological satellite, Cheollian-1 in Korean), Korea's first geostationary satellite developed through an R&D program. KARI is also currently developing two(2) follow-on GEO-KOMPSAT-2(2nd Geostationary Earth Orbit Korea Multi-Purpose SATellite, Cheollian-2 in Korean) satellites simultaneously. GEO-KOMPSAT-2 is also referred to as GK2 in a simplified form with each of the two satellites called GK2A & GK2B, respectively.

A geostationary orbit satellite is designed to circle the earth at 11,000km/hour, which is the same speed as the rotational velocity of earth at 35,786km above the equator. As it can view a broad area in a specific direction at all times, it is generally used for weather observation or communication relay services.

  • 01COMS (Cheollian-1, GEO-KOMPSAT-1)

    COMS, Korea's first geostationary orbit satellite developed through an R&D program, is a multifunctional satellite capable of carrying out communications, marine ocean monitoring and weather observation functions while circling the earth at with a velocity equal to the earth’s rotational velocity at the altitude of 35,786km above the equator. It provides satellite communication services and observes the weather and marine ocean environments around the Korean Peninsula 24 hours a day.
    With the launch of COMS, Korea became the seventh country after the US, Europe, Japan, China, India and Russia to develop its own weather satellite. Consequently, more accurate weather services can now be provided on its own without having to depend on other countries for weather data.
    COMS is also the world's first ocean observing geostationary orbit satellite, which is presently monitoring the marine environment around the Korean Peninsula in real time. As the tenth country in the world to develop a Ka-band communications payload, Korea laid has acquired the foundation for a next-generation satellite information and communications system that can provide satellite communications, broadcasting, geographic information and traffic information services.

    • Specifications2.8m x 2.2m, Height: 3.7m, Mass: 2,460kg
    • Operating Orbit35,786km
    • MissionWeather observation/Ocean monitoring/Ka-band telecommunications
    • FeatureKorea's first geostationary satellite developed through an R&D program
    • Launch dateJune 27, 2010
  • 02GEO-KOMPSAT-2 (GK2, Cheollian-2)

    The GEO-KOMPSAT-2 (GK2) satellites will inherit the mission of COMS(Cheollian-1) to observe the weather and ocean environment and strengthen the national capability to monitor the environment around the Korean Peninsula. Two satellites will be developed: a weather and space weather observation satellite (GK2A) and ocean and environmental observation satellite (GK2B).
    The weather observation capability of GK2A will be more than four times greater than that of COMS, while the observation interval and observation channels will both be improved more than threefold. The satellite is expected to greatly improve the accuracy of precision weather observation and weather forecasting, as well as enhance the capability to monitor and forecast unusual weather conditions in the Korean Peninsula and the Asian region.
    The resolution of the ocean observation payload of GK2B, an ocean/environmental observation satellite, is also more than four times that of the COMS satellite. The environmental observation payload will monitor the movement of border-crossing atmospheric pollutants such as fine dust and yellow sand in 7km resolution 8 times a day.
    The weather observation satellite GK2A is scheduled for launch in May 2018, to be followed by the ocean/environmental observation satellite GK2B in March 2019.

    천리안 2A호/2B호 (정지궤도복합위성)
    Subject COMS (Cheollian-1, GK1) GEO-KOMPSAT-2 (GK2, Cheollian-2)
    Development Period ‘03.9 ~ ‘10.12 ‘11.7 ~ ‘19.9
    Launch ‘10.6.27 GK2A (Weather) ‘18.5, GK2B (Ocean/Environmental) ’19.3
    Mission Lifetime 7 years 10 years
    Mission Satellite communications, weather and ocean observation Weather/space weather observation, ocean/environmental observation
    Launch Weight 2.5 ton class 2A (~3.5 ton class), 2B (~3.5 ton class)
    Resolution Weather 1km (IR channel 4km), Ocean 500m Weather 1km (visible channel 500m, IR channel 2km), Ocean 250m, Environmental 7km
    Ground Payload 5 channels (visible 1, IR 4) 16 channels (visible 4, IR 12)
    Marine Payload 8 channels (visible 8) 13 channels (visible 9, near IR 3, wide area 1)
    Communication Payload Ka band -
    Environmental Payload - Hyper-spectral (spectral resolution 0.6nm)
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