Long-Term Evolution of the KOMPSAT-1 Orbit
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Long-Term Evolution of the KOMPSAT-1 Orbit' Byoung-Sun Lee 2, Jeong-Sook Lee2, and Jae-Hoon Kim 2 Abstract A long-term orbital evolution of the Korea Multi-Purpose Satellite-l is monitored and analyzed in this paper. Four years of orbital evolution is divided into four phases in terms of the operational status of the satellite. Orbit determination results, which are obtained from the satellite's GPS navigation data, are used to convert the osculating orbit into the mean orbit. Variation of the mean altitude by orbit maneuvers and safe-hold mode operations is also analyzed. Decay of the mean altitude by natural atmospheric drag is correlated with the solar flux variation. Variation of the mean inclination is analyzed in terms of the shift of the local time of the ascending node crossing. The evolution from a near frozen orbit is monitored and analyzed in a phase plot of the mean argument of perigee and mean eccentricity.
Introduction The KOrea Multi-Purpose SATellite-l(KOMPSAT-l) was successfully launched by a Taurus launch vehicle at 07: 13:00 UTC, December 21, 1999, from Vandenberg Airforce Base, California, U.S.A. Since then, the satellite has been successfully operated by the Korean Ground Station (KGS) located at the Korea Aerospace Research Institute (KARl) in Daejeon, Korea. The satellite is designed to operate in a Sun synchronous orbit with a mean altitude of 685 km, an inclination of 98.13 degrees, and a local time of ascending node of 10:50 a.m. The main mission of the satellite is to perform cartography of the Korean peninsula using a 6.6 m resolution panchromatic camera during the design life of three years. The secondary mission is to take large-scale multi-spectral images of the ocean. The other science missions are ion layer measurement and highenergy particle detection. The KGS is comprised of the Mission Control Element (MCE) and the Image Reception and Processing Element (IRPE). The MCE is responsible for the satellite mission control such as telemetry processing, command transmission, mission planning, flight dynamics support, and anomaly resolution. The MCE was 'Presented as paper AAS 03-237 at the 13th AAS/AIAA Space Flight Mechanics Meeting, Ponce, Puerto Rico, February 9-13, 2003. 2Satellite Ground Control Technology Team, Electronics and Telecommunications Research Institute (ETRI), 161 Gajeong-dong, Yuseong-gu, Daejeon, 305-350 Korea.
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developed by the Electronics and Telecommunications Research Institute (ETRI), Korea [I]. The IRPE is used for collecting and processing the image data from the satellite. The IRPE was purchased from Datron Advanced Technologies, U.S.A. As of January I, 2003, the KOMPSAT-I is still in a normal operational mode, exceeding the design lifetime of three years. A few more years of operation are expected with 70% of the fuel remaining. The on-board thrusters were fired only during the orbit maneuvers in the Launch and Early Orbit Phase (LEOP) operations and safe-hold mode operations. Since the last safe-hold mode operations on the 23rd of No
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