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학술대회 Monitoring of Geostationary-earth-orbiter Satellite Thruster Efficiency
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황유라, 이병선
International Conference on Space Operations (SpaceOps) 2018, pp.1-10
Geostationary-earth-orbiter (GEO) satellites perform station-keeping (SK) maneuver once per week or every other week, which is dependent on the satellite missions. In order to perform SK maneuver, the flight-dynamics-subsystem (FDS) plans amounts of the velocity increments and the firing time, and it reconstructs the planned velocity increments based on the thruster modeling provided by satellite manufacturer. Then parameters related to the maneuver are uploaded to the satellite. However, the maneuver parameters are up to satellite flight software: some upload the firing time and the planned velocity increments and the others transmit the firing time and the reconstructed velocity increments. The satellite executes the command by following flight software mounted on-board. After carrying out the maneuver, the telemetry, related to the each thruster information such as pulse numbers and accumulated on time, is transmitted to the ground. In the ground control center, it calculates fuel usage amounts and estimates the GEO satellite's service lifetime. The thruster efficiency can be calculated and monitored by several methods. First is to conduct the orbit determination (OD) using tracking and ranging data classifying before and after maneuver at the epoch of the firing time. The velocity differences of the OD results by the before and after maneuver at the epoch of the firing time provide the delta velocity due to the maneuver. Second is to estimate the velocity increments at the epoch of the firing impulse time during the OD. Third is to compare the reconstructed velocity increments by thruster modeling and actually calculated velocity increments by fuel accounting (FA). In this paper, we monitor and analyze each thruster efficiency by suggested theoretical methods and estimate the GEO satellite lifetime.
KSP 제안 키워드
Firing time, Flight Software, GEO satellite, Ground control, On-board, Orbit determination, Pulse number, Station-keeping, Theoretical methods, control center, flight dynamics