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E/I-Vector Separation for Safe Switching of the GRACE Formation

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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Official URL: http://www.sciencedirect.com/

Abstract

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.

Document Type:Article
Title:E/I-Vector Separation for Safe Switching of the GRACE Formation
Authors:
AuthorsInstitution or Email of Authors
Montenbruck, OliverUNSPECIFIED
Kirschner, MichaelUNSPECIFIED
D'Amico, SimoneUNSPECIFIED
Bettadpur, SrinivasUT/CSR
Date:14 January 2006
Journal or Publication Title:Aerospace Science and Technology
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:10
DOI:DOI 10.1016/j.ast.2006.04.001
Page Range:pp. 628-635
Publisher:Elsevier
Status:Accepted
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)
Location: Oberpfaffenhofen
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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