Perigee attitude maneuvers of geostationary satellites during electric orbit raising

David Mostaza Prieto, Peter Roberts

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    Abstract

    When full-electric orbit raising trajectories begin in a classic geostationary transfer orbit with low initial perigee altitude, the need for deployed solar arrays to power the propulsion system significantly increases the aerodynamic and gravity gradient torques. In fact, the torque magnitudes in the first few perigee passages may become a challenging requirement for the attitude control system. Apart from oversizing ac- tuators, other solutions may include the need for a backup thruster system or raising the perigee altitude, implying mass penalties and cost. This paper presents the design of an optimal attitude maneuver at the perigee that can be undertaken using nomi- nal reaction wheels. Attitude paths avoiding saturation of the wheels while dumping accumulated momentum are obtained performing a physically consistent modelling of aerodynamic torques and using Pseudospectal methods to solve the trajectory opti- mization problem. The optimization of solar array positions is also explored to further constrain the problem or improve the maneuver performance. Resulting mass and cost savings can be significant, which could be used for additional payload or to significantly extend the operational life of the satellite.
    Original languageEnglish
    Pages (from-to)1978-1989
    Number of pages12
    JournalJournal of Guidance, Control, and Dynamics
    Volume40
    Issue number8
    Early online date18 May 2017
    DOIs
    Publication statusPublished - 2017

    Keywords

    • orbital aerodynamics
    • geostationary transfer orbit
    • perigee passage
    • aerodynamic torques
    • trajectory optimisation
    • satellite

    Research Beacons, Institutes and Platforms

    • Aerospace Research Institute

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