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EnglishThe need to limit the population of artificial debris in near-Earth space motivates the development of efficient deorbiting propulsion systems. Electrodynamic tethers offer a valid and attractive alternative to conventional chemical thrusters because they impose a penalty in terms of deorbiting time rather than additional launch mass. A low-cost demonstration mission is designed, where a reduced-scale deorbiting system will be carried, deployed, and controlled by a microsatellite. Numerical simulations show that the proposed configuration of the electrodynamic system allows, even in absence of active tether current control, to maintain a stable tether attitude motion. This is obtained through a careful combination of bare and insulated tether segments. When active current control is applied, the tether libration angles are bounded to within 10 deg. The closed-loop control laws make use of the in-plane and out-of-plane libration angles and rates, which are estimated through a newly developed extended Kalman filter. The estimator's measurements are provided by two three-axis magnetometers mounted on the spacecraft structure and at the lower tether endpoint, respectively. It is shown that this microsystem is able to deorbit a low-Earth-orbit carrier spacecraft in about two months, demonstrating salient features of tether technologies and associated electrodynamic effects.
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| Titolo: | Small mission design for testing in-orbit an electrodynamic tether deorbiting system |
| Autori: | |
| Data di pubblicazione: | 2006 |
| Rivista: | |
| Handle: | http://hdl.handle.net/11573/16647 |
| Appartiene alla tipologia: | 01a Articolo in rivista |
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http://hdl.handle.net/11573/16647
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