July 8, 2026

[APSI Secures Flight Heritage for Its Standard On-Board Computer

(OBC) Following Successful First Contact

with Korea Medium Satellite 4]

APSI, a satellite communications and space industry company, announced that the Korea Medium Satellite 4, equipped with the Standard On-Board Computer (OBC) supplied by APSI, has successfully completed its launch and initial communication. Through this mission, APSI has further strengthened its flight heritage by demonstrating the successful operation of a key satellite avionics component on a national satellite platform.

APSI announced on July 8 that the Korea Medium Satellite 4, incorporating the company's Standard On-Board Computer (OBC) flight model, was successfully launched on July 7 from Vandenberg Space Force Base in California, United States.

The satellite was launched aboard SpaceX's Falcon 9 launch vehicle. Following successful separation from the rocket, it established its first communication with the Svalbard ground station in Norway. The Korea AeroSpace Administration (KASA) confirmed through ground station communication that the satellite is in good health and has successfully entered its planned sun-synchronous orbit.

APSI previously signed a contract to supply the Standard On-Board Computer (OBC) flight models for the Korea Medium Satellite 4 and 5 programs. With the successful launch of Satellite 4, APSI has secured another flight-proven operational record of its core avionics technology on a national satellite platform.

The Standard On-Board Computer (OBC) is a mission-critical subsystem that controls the satellite's core functions and supports mission operations. APSI designed the system with a modular architecture and standardized communication interfaces, enabling easier adaptation to various satellite platforms while reducing development time and cost.

Korea Medium Satellite 4 is an Earth observation satellite capable of imaging the Korean Peninsula every three days. After approximately four months of in-orbit commissioning, it is scheduled to begin operational service in the first half of 2027, supporting public applications such as agriculture and forest management, disaster response, and climate change monitoring.

An APSI representative said, "The Standard On-Board Computer (OBC) is a core avionics subsystem that ensures the stable operation of satellite platforms. Building on the experience gained through the Korea Medium Satellite Program and our expertise in modular and standardized satellite technologies, APSI will continue expanding its role in Korea's national space development initiatives."