Montenbruck, Oliver and Kirschner, Michael and D'Amico, Simone and Bettadpur, Srinivas (2006) E/I-Vector Separation for Safe Switching of the GRACE Formation. Aerospace Science and Technology, 10 (7), pp. 628-635. Elsevier. DOI: DOI 10.1016/j.ast.2006.04.001.
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After more than three years in orbit, a longitude swap maneuver was required to exchange the leading and trailing spacecraft of the GRACE formation. While the two satellites are nominally separated by about 220km in along-track direction, a close encounter took place during the swap sequence. Based on the successful use for co-location of geo-stationary satellites, the concept of eccentricity/inclination vector separation has been suggested for safe proximity operations in this mission phase. Taking care of the natural evolution of the relative orbital elements of GRACE 1 and 2, optimum maneuver dates were identified. By proper timing of the maneuvers a safe limit for the minimum distance during the encounter could be guaranteed even in case of arbitrary thruster performance errors. This allowed the use of a fuel optimal maneuver sequence with individual drift start and stop maneuvers. The paper provides a conceptual outline and mathematical description of the e/i-vector separation for spacecraft formations in low Earth orbit and discusses the GRACE longitude swap maneuvers.
|Title:||E/I-Vector Separation for Safe Switching of the GRACE Formation|
|Date:||14 January 2006|
|Journal or Publication Title:||Aerospace Science and Technology|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 628-635|
|Keywords:||Formationsflug, nahe Begegnung, e/i-Vektor Trennung, GRACE, Formation flying, proximity operations, e/i-vector separation, GRACE|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W SY - Technik für Raumfahrtsysteme|
|DLR - Research area:||Space|
|DLR - Program:||W SY - Technik für Raumfahrtsysteme|
|DLR - Research theme (Project):||W -- no assignement (old)|
|Institutes and Institutions:||Space Operations and Astronaut Training|
|Deposited By:||Dr.rer.nat.hab. Oliver Montenbruck|
|Deposited On:||22 Jan 2007|
|Last Modified:||14 Jan 2010 20:46|
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