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KOMPSAT-3
Names	Korean Multi-purpose Satellite-3; Arirang-3
Mission type	Earth observation
Operator	Korea Aerospace Research Institute
COSPAR ID	2012-025B
SATCAT no.	38338
Mission duration	4 years (planned); 12 years and 7 months (in progress)
Spacecraft properties
Spacecraft type	KOMPSAT
Manufacturer	Korea Aerospace Industries; Korea Aerospace Research Institute; EADS Astrium (bus)
Launch mass	980 kg (2,160 lb)
Dimensions	2.9 m in diameter x 3.5 m in height
Power	1.3 kW
Start of mission
Launch date	17 May 2012, 16:39 UTC
Rocket	H-IIA (202) (# 21)
Launch site	Tanegashima Space Center
Contractor	Mitsubishi Heavy Industries
Entered service	29 March 2013
Orbital parameters
Reference system	Geocentric orbit
Regime	Sun-synchronous orbit
Altitude	685 km (426 mi)
Inclination	98.13°
Period	98.5 minutes
Instruments
	Advanced Earth Imaging Sensor System (AEISS)
	KOMPSAT programme ← KOMPSAT-2 KOMPSAT-5 →

KOMPSAT-3 (Korean Multi-purpose Satellite-3), also known as Arirang-3,^[2] is a South Korean multipurpose Earth observation satellite. It was launched from Tanegashima Space Center, Japan at 16:39 UTC on 17 May 2012. Like the earlier KOMPSAT-1 and KOMPSAT-2 satellites, it takes its name from the popular Korean folk song Arirang. Its launch was the culmination of a project begun in 1995.^[3]

KOMPSAT-3 orbits at a height of 685.1 km (425.7 mi), circling the Earth 14 times per day, and is expected to maintain that orbit for 4 years. It weighs 980 kg (2,160 lb). The satellite carries an Advanced Earth Imaging Sensor System (AEISS), which can distinguish to a 70-cm resolution, allowing the identification of individual vehicles on the ground.^[4]

The satellite was succeeded by KOMPSAT-5 and KOMPSAT-3A, which were launched on 2013 and 2015 respectively.

History

South Korea started the KOMPSAT programme in 1995 to nurture its national Earth-imaging industry and supply services for remote-sensing applications. The South Korean KOMPSAT-3 Earth-imaging satellite was developed by Korea Aerospace Industries (KAI) and Korea Aerospace Research Institute (KARI), in partnership with EADS Astrium, to assure continuity with the KOMPSAT-2 satellite launched in 2006. KOMPSAT-3 was orbited on 17 May 2012 by a launch vehicle from Tanegashima Space Center, Japan. SI Imaging Services is the worldwide exclusive distributor of KOMPSAT imagery since November 2012.^[4]

Technologies

Orbit

KOMPSAT-3 operates in a near-polar, circular Sun-synchronous orbit. The orbital parameters are:

Mean altitude: 685.1 km
Mass: 980 kg
Inclination: 98.13° (Sun-synchronous orbit)
Orbital period: 98.5 minutes
Orbital cycle: 28 days

Instruments

KOMPSAT-3's instruments are designed to acquire high- and very-high-resolution imagery with a footprint of 16.8 km. The satellite has the capacity to acquire 20 minutes of imagery on each orbit and it can steer its sensors both ways out to 30° off track. Panchromatic and multispectral images can be acquired at the same time.

KOMPSAT-3 radiometer features:

Kompsat-3 radiometric parameters
mode	Channel	Spectral band	Spatial resolution	Footprint
Multispectral	1	0.45 - 0.52 μm (blue)	2.8 m	16.8 km
	2	0.52 - 0.60 μm (green)	2.8 m	16.8 km
	3	0.63 - 0.69μm (rouge)	2.8 m	16.8 km
	4	0.76 - 0.90 μm (near-infrared)	2.8 m	16.8 km
Panchromatic	P	0.50 - 0.90 μm (black and white)	70 cm	16.8 km

Ground receiving stations

Two receiving stations deliver KOMPSAT-3 imagery 1 to 3 days after acquisition. The Deajeon station in South Korea is responsible for tasking the satellite.

Advantages and applications of KOMPSAT-3 imagery

KOMPSAT-3 is designed for very-high-resolution (VHR) remote-sensing applications, such as:

Land planning: to detect and identify features smaller than 1 square meter, e.g. vehicles, street furnishings, roads and bushes
Agriculture: to pinpoint crop or tree diseases
Urban planning and demographics: to locate detached houses
Civil engineering: to plan road, railroad and oil pipeline corridors
Defence: to describe high-value assets or military sites

South Korea

It serves along with the existing Kompsat-2 to provide continuous satellite observation of the Korean Peninsula, sending images twice a day at 01:30 and 13:30.^[5]

References

^ "Trajectory: Kompsat 3 2012-025B". NASA. 21 October 2021. Retrieved 22 October 2021. This article incorporates text from this source, which is in the public domain.
^ "KOMPSAT 3 (Arirang 3)". Gunter's Space Page. 7 July 2020. Retrieved 22 October 2021.
^ "KOMPSAT-1". ESA eoPortal Directory. 2021. Retrieved 22 October 2021.
^ ^a ^b "KOMPSAT-3". ESA eoPortal Directory. 2021. Retrieved 24 October 2021.
^ "Arirang-3 launch lifts Korea's space program". The Korea Herald. 19 June 2012. Retrieved 24 October 2021.