Walker-Delta Constellation Orbit Design Considering Korea Space Launch Vehicle-II (KSLV-II) Performance

Korea Space Launch Vehicle-II (KSLV-II) shows the highest efficiency at an input angle of 80 degrees. The launch azimuth angle is fixed at about 172 degrees due to the geographical location and safety range issues of the launch site. The inclination angle of 45 degrees mentioned in recent domestic satellite constellation studies is required yaw maneuvers, which inevitably causes loss in performance. In this study, the satellite constellation are designed based on the 80 degrees inclination, maximizing the injection performance of the payload of KSLV-II, and the Walker-Delta constellation with 5 and 6 orbital planes are designed to analyze the revisit time (RT) of the area of interest. It was confirmed that the average RT was about 45 minutes and the feasibility of the satellite constellation was considered.