A Study on the East-West Station Keeping Box of Koreasat 2

Lee, Sang Cheol; Kim, Bang-Yeop; Park, Bong-Gyu

doi:10.5139/jksas.2003.31.9.075

Cited by 3 publications

(4 citation statements)

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“…Park et al (2004) improved the existing autonomous station keeping system by applying a modified 'fly-the-wire' method and the geostationary satellite positioning system of COMS (Communication, Ocean and Meteorological Satellite) was investigated in Lee et al (2005) for orbit determination and autonomous satellite operation. A study was also done on performing one of two East/West station keeping maneuvers during one of two daily wheel off-loading maneuvers (Lee et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Geostationary Satellite Station Keeping Robustness to Loss of Ground Control

Woo¹,

Buckwalter²

2021

Journal of Astronomy and Space Sciences

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For the vast majority of geostationary satellites currently in orbit, station keeping activities including orbit determination and maneuver planning and execution are ground-directed and dependent on the availability of ground-based satellite control personnel and facilities. However, a requirement linked to satellite autonomy and survivability in cases of interrupted ground support is often one of the stipulated provisions on the satellite platform design. It is especially important for a geostationary military-purposed satellite to remain within its designated orbital window, in order to provide reliable uninterrupted telecommunications services, in the absence of ground-based resources due to warfare or other disasters. In this paper we investigate factors affecting the robustness of a geostationary satellite’s orbit in terms of the maximum duration the satellite’s station keeping window can be maintained without ground intervention. By comparing simulations of orbit evolution, given different initial conditions and operations strategies, a variation of parameters study has been performed and we have analyzed which factors the duration is most sensitive to. This also provides valuable insights into which factors may be worth controlling by a military or civilian geostationary satellite operator. Our simulations show that the most beneficial factor for maximizing the time a satellite will remain in the station keeping window is the operational practice of pre-emptively loading East-West station keeping maneuvers for automatic execution on board the satellite should ground control capability be lost. The second most beneficial factor is using short station keeping maneuver cycle durations.

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Section: Introductionmentioning

confidence: 99%

Geostationary Satellite Station Keeping Robustness to Loss of Ground Control

Woo¹,

Buckwalter²

2021

Journal of Astronomy and Space Sciences

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“…Station keeping is performed periodically to place geostationary satellites within the designated zones. For instance, Korea performs station keeping for the Communication, Ocean and Meteorological Satellite (COMS) in the north-south direction and in the east-west direction one time per week and for the KOREASAT satellite one time per week with the ±0.05 degree zone (Lee et al 2003(Lee et al , 2011b. Thus, the geostationary satellites currently in operation are always within the designated zones.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Strategies of the Positioning of a Satellite on Observed Images by the Astronomical Telescope and the Observation and Initial Orbit Determination of Unidentified Space Objects

Choi¹,

Jo²,

Choi³

et al. 2011

Journal of Astronomy and Space Sciences

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An optical tracking system has advantages for observing geostationary earth orbit (GEO) satellites relatively over other types of observation system. Regular surveying for unidentified space objects with the optical tracking system can be an early warning tool for the safety of five Korean active GEO satellites. Two strategies of positioning on the observed image of Communication, Ocean and Meteorological Satellite 1 are tested and compared. Photometric method has a half root mean square error against streak method. Also null eccentricity method for initial orbit determination (IOD) is tested with simulation data and real observation data. Under 10 minutes observation time interval, null eccentricity method shows relatively better IOD results than the other time interval. For follow-up observation of unidentified space objects, at least two consecutive observations are needed in 5 minutes to determine orbit for geosynchronous orbit space objects.

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“…The linearized equations can be obtained in terms of the eccentricity vector, inclination vector, and longitude variation with each velocity component. The required velocity increment fluctuates between 40 and 51 m/s per year for inclination stationkeeping and up to 2 m/s per year for longitude stationkeeping [13,14,15]. The maneuver time and delta-V can be acquired to keep their position maintained in stationkeeping box by solving the system of nonlinear equations defined by Equations (5) - (7).…”

Section: Geostationkeeping and Leo Ground Track Maintenancementioning

confidence: 99%

“…The population size is five [18,19]. The fitness function can be written as (8) Inequality constraints for a LEO satellite are Inequality constraints for a GEO satellite are (12) (13) (14) (15) where denotes consumed fuel mass and is allowable fuel mass after the maneuver; denotes the amount of deviation from a stationkeeping box for the GEO satellite or the deviation of a ground track boundary for the LEO satellite;…”

Section: Simulation Setupmentioning

confidence: 99%

Collision Avoidance Maneuver Planning Using GA for LEO and GEO Satellite Maintained in Keeping Area

Lee¹,

Kim²,

Suk³

2012

International Journal of Aeronautical and Space Sciences

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In this paper, a collision avoidance maneuver was sought for low Earth orbit (LEO) and geostationary Earth orbit (GEO) satellites maintained in a keeping area. A genetic algorithm was used to obtain both the maneuver start time and the delta-V to reduce the probability of collision with uncontrolled space objects or debris. Numerical simulations demonstrated the feasibility of the proposed algorithm for both LEO satellites and GEO satellites.

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A Study on the East-West Station Keeping Box of Koreasat 2

Cited by 3 publications

References 0 publications

Geostationary Satellite Station Keeping Robustness to Loss of Ground Control

Geostationary Satellite Station Keeping Robustness to Loss of Ground Control

A Study on the Strategies of the Positioning of a Satellite on Observed Images by the Astronomical Telescope and the Observation and Initial Orbit Determination of Unidentified Space Objects

Collision Avoidance Maneuver Planning Using GA for LEO and GEO Satellite Maintained in Keeping Area

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