KOMPSAT-3 satellite Information

KOMPSAT-3 is an optical sub-meter resolution Korean observation mission of KARI (Korea Aerospace Research Institute).
The main mission objectives of KOMPSAT-3 system are to provide the following applications:

– Continuation of satellite earth observation after KOMPSAT-1 and KOMPSAT-2 to meet national need
– Provision of the high-resolution EO (Electro-Optical) images required for GIS (Geographical Information Systems) establishment and the applications for environmental, agriculture and ocean monitoring

The KOMPSAT-3 spacecraft was launched on May 17, 2012 (UTC) from the Tanegashima Space Center of JAXA, Japan on the H-IIA launch system.
Sun-synchronous near-circular orbit, altitude 685 km, inclination 98.13º , period 98.5 minutes. LTAN (Local Time on Ascending Node) is 13:30 hours.
Imaging modes
KOMPSAT-3 supports various missions using agile maneuver such as strip imaging, multi point imaging, single pass stereo imaging.
Strip Imaging
For the strip imaging, the spacecraft bus is slewed about the roll and the pitch axis into the reference attitude before the imaging starts. During imaging, this reference attitude is kept nearly constant. Yaw steering is performed during imaging for image quality.
Multi Point Imaging
Multi point imaging is to collect several place image where is left, right, up and down side from satellite pass in a single pass. In this image collection, the satellite has to be tilted in roll & pitch direction as required before starting imaging. During imaging period, satellite has no maneuvers like strip imaging. Yaw steering is performed during imaging for image quality.
single pass stereo imaging
The single pass stereo imaging is to collect the stereo image of a target during a single pass. It is similar to multi pointing imaging.

Imaging performance

In KOMPSAT-3 design 10 minutes is considered as a maximum imaging time of strip type imaging during one orbit and 50 minutes during one day. The satellite can be tilted up to +/-56 degree from LVLH about roll axis and up to +/-30 degree about pitch axis
· High resolution capability
– 0.7m PAN & 2.8m MS with 16km swath @nadir
· Unique local time increases visibility
– 13:30 local time
· More infomation per pixel : 14 bits/pixel
· Data suit by constellation of Optical and Radar
– KOMPSAT-2 (Optical 1 m), KOMPSAT-3 (Optical 0.7 m) and KOMPSAT-5 (SAR 1 m, to-be-launched)
· Data continuity guaranteed by long-term government commitment