∎ STSAT-2

STSAT-2 was Korea’s first 100kg low Earth orbit satellite to be launched in the first domestically developed launch vehicle (KSLV-1). Unfortunately, both STSAT-2A, launched on Aug. 25, 2009, and STSAT-2B, launched on Jun. 10, 2010, failed at the orbital injection stage.

STSAT-2 utilized most of the experience and outcomes from the STSAT-1 project. The goals were to enhance performance and achieve further miniaturization.

STSAT-2 was a frame-type satellite structure and had been scheduled to test a range of core technologies including a composite material solar panel, Dual Head Star Tracker (DHST), CCD digital sun sensor, Pulsed Plasma Thruster (PPT), Compact on-board Satellite Computer, and X-band Transmitter.

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Objectives
- To operate a radiometer for earth and atmosphere monitoring
- To verify precise orbit and attitude determination technologies
- To develop and verify core satellite technologies
- To develop and operate world-class advanced observation devices Key Specifications

Orbit	inclination 80°, altitude 300×1500km
Size	< 1m3
Weight	< 100kg (Including adaptor)
Power Rating	160WⓐEOL
Attitude Control Method	3-axis stabilization, 0.15 deg pointing accuracy
Communication (Transfer Speed)	S-band Uplink: 9.6kbps S-band Downlink: 38.4kbps X-band Downlink: 10Mpbs
Main Computer	Power PC 603e
Core Technologies	Dual Head Star Tracker(DHST) Fine Digital Sun Sensor(FDSS) Pulsed Plasma Thruster(PPT) Electro-magnetic Torque(EMT) Compact On-board Computer X-band Transmitter
Payloads	Dual-channel Radiometers for Earth and Atmosphere Monitoring(DREAM) Laser Reflector Array(LRA)