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KARI is currently operating Cheollian-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 Cheollian-2A and Cheollian-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.
01Communications / Ocean / Meteorological Satellite(COMS), Cheollian-1
Cheollian-1, Korea's first geostationary satellite, is a multifunctional satellite capable of carrying out communications, ocean and meteorological functions. It is circling the earth at the earth’s rotation velocity 36,000km above the equator providing satellite communication services and monitoring the weather and marine environment around the Korean Peninsula 24 hours a day.
With the launch of Cheollian-1, Korea became the seventh country after the USA, Europe, Japan, China, India, and Russia to develop its own weather satellite. As such, it can now independently provide a more accurate weather service without having to rely on weather data from other countries.
Cheollian-1 is also the world's first ocean monitoring geostationary satellite monitoring the marine environment around the Korean Peninsula in real time. As the tenth country in the world to develop a communications satellite, Korea laid the foundation for a next-generation satellite data communication system that can provide satellite communications, broadcasting, geographic information services and traffic information.
02Geostationary Earth Orbit Korea Multi-Purpose Satellite(GEO-KOMPSAT-2, GK2), Cheollian-2
The geostationary multifunctional satellite, Cheollian-2 will continue the mission of Cheollian-1 to monitor the weather and ocean color and will also strengthen the national capability to monitor the atmospheric environment around the Korean Peninsula through the development of two satellites: a weather and space weather monitoring satellite (2A) and an ocean and environment monitoring satellite (2B).
The weather monitoring capability of the geostationary multifunctional satellite, Cheollian-2A will be more than four times greater than that of Cheollian-1, while the observation interval and number of channels will both be improved by more than threefold. The satellite is expected to greatly improve the accuracy of precision weather monitoring and weather forecasting, as well as the capability to monitor and forecasting extreme weather in the Korean Peninsula and the Asian region.
The resolution of the ocean monitoring payload of Cheollian-2B is also better of four times than that of the Cheollian-1 satellite. The environment monitoring payload will monitor the movement of and measure border-crossing atmospheric pollutants such as NO2, SO2, HCHO, and fine particulate matter and yellow sand with 0.6 nm spectral resolution 8 times a day. The planned launch dates for the two geostationary multifunctional satellites, Cheollian-2A and Cheollian-2B are May 2018, March 2019, respectively.
|Subject||Communication/Ocean/Meteorological Satellite(COMS), Cheollian-1||Geostationary Earth Orbit Korea Multi-Purpose Satellite(GEO-KOMPSAT-2, GK2), Cheollian-2|
|Development Period||September 2003~December 2010||July 2011~September 2019|
|Launch||June 27, 2010||2A (Weather, Space Weather) May 2018
2B (Ocean/Environment) March 2019
|Mission Lifetime||7 years||10 years|
|Mission||Satellite communications, weather and ocean monitoring||weather/space weather monitoring, ocean/environmental monitoring|
|Launch Weight||2.5 ton class||2A (~3.5 ton class), 2B (~3.5 ton class)|
|Resolution||- Meteorological 1km (IR channel 4km)
- Ocean 500m
|- Meteorological 1km (visible channel 500m, IR channel 2km)
- Ocean 250m, Environmental 7km
|Meteorological Payload||5 channels (visible 1, IR 4)||16 channels (visible 4, IR 12)|
|Ocean Payload||8 channels (visible 8)||13 channels (visible 9, near IR 3, wide area 1)|
|Communications Payload||Ka band||-|
|Environmental Payload||-||Hyper-spectral (spectral resolution 0.6nm)|