AS MICROELECTROMECHANICAL system fabrication technology advances, the aerospace industry, in pursuing smaller, faster, and cheaper satellites, sees several opportunities for effective satellite operations. Miniature satellites with 1–10 and 10–100 kg masses are called nanosatellites and microsatellites, respectively; and they offer the advantages of faster and cheaper operation. With formation flight using several small satellites, the revisit time can be drastically improved, and almost real-time Earth observation is expected to be possible in the near future. ; This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (no. NRF-2015R1A2A1A15055373).