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| Titel |
The BepiColombo Mission to Mercury: reaction wheels desaturation manoeuvres and the ISA accelerometer Î âV measurements |
| VerfasserIn |
Valerio Iafolla, Sergio Nozzoli, David Lucchesi, Francesco Santoli, Roberto Peron, Emiliano Fiorenza, Carlo Lefevre, Andrea Reale |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250042512
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| Zusammenfassung |
| The MPO will be a three–axis stabilized spacecraft and nadir pointing to Mercury
center–of–mass. Such a pointing, needed for the very ambitious goals of the ESA space
mission to Mercury denominated BepiColombo, is reached thanks to the onboard reaction
wheels, and it is also required during the unobserved (from Earth) arcs. The unavoidable
manoeuvres of desaturation of the reaction wheels, which are necessary to remove the
accumulated angular momentum, represent a clear reduction of the accuracy of the objectives
of the ESA space mission. Indeed, during these manoeuvres the spacecraft thrusters are fired
—- to guarantee the planet center–of–mass pointing —- and directly impact the accuracy
of the propagated state–vector of the satellite at the beginning of the subsequent
observed arc. Their impact is quantified by their number, position along the orbit and,
especially, in the uncertainty in the linear momentum transferred to the spacecraft. This
presentation is devoted to prove the feasibility of the measurements of the transferred
momentum by the thruster thanks to the onboard accelerometer ISA. Therefore, such
measurements will be an essential ingredient in order to preserve the accuracy of the
BepiColombo Radio Science Experiments and of the pointing accuracy of other onboard
instruments, as is the case of BELA. This additional capability of ISA strengthen once
more the key rôle of the accelerometer in the BepiColombo mission to Mercury. |
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