Once the satellite is delivered from the satellite manufacturer and can be successfully placed in the desired outer space using a rocket service, the operation of the satellite begins. Simply put, satellite operation consists of (1) checking the health of the satellite and (2) maintaining the satellite in the correct position. Our company’s satellites are placed in outer space approximately 36,000 km above the ground (the altitude at which airplanes fly is approximately 10 km, and the distance from the Earth to the Moon is approximately 380,000 km). Once a satellite is launched, it is difficult with current technology to go into outer space and repair broken parts, so it is important to constantly check the health of the satellite and take necessary measures in advance to prevent it from breaking. Also, although outer space is said to be zero gravity, satellites gradually move from their original positions due to the influence of the gravity of the sun and the moon. If a satellite is not in a fixed location, it causes inconvenience for communication, so it is necessary to keep the satellite in the correct position by gradually injecting fuel with small engines mounted on the satellite called “thrusters.”
