JAXA Repository / AIREX 未来へ続く、宙(そら)への英知

このアイテムに関連するファイルはありません。

タイトルVenusian atmospheric and Magellan properties from attitude control data
本文(外部サイト)http://hdl.handle.net/2060/19950005278
著者(英)Tolson, Robert H.; Croom, Christopher A.
著者所属(英)George Washington Univ.
発行日1994-08-01
言語eng
内容記述Results are presented of the study of the Venusian atmosphere, Magellan aerodynamic moment coefficients, moments of inertia, and solar moment coefficients. This investigation is based upon the use of attitude control data in the form of reaction wheel speeds from the Magellan spacecraft. As the spacecraft enters the upper atmosphere of Venus, measurable torques are experienced due to aerodynamic effects. Solar and gravity gradient effects also cause additional torques throughout the orbit. In order to maintain an inertially fixed attitude, the control system counteracts these torques by changing the angular rates of three reaction wheels. Model reaction wheel speeds are compared to observed Magellan reaction wheel speeds through a differential correction procedure. This method determines aerodynamic, atmospheric, solar pressure, and mass moment of inertia parameters. Atmospheric measurements include both base densities and scale heights. Atmospheric base density results confirm natural variability as measured by the standard orbital decay method. Potential inconsistencies in free molecular aerodynamic moment coefficients are identified. Moments of inertia are determined with a precision better than 1 percent of the largest principal moment of inertia.
NASA分類GEOPHYSICS
レポートNO95N11691
NASA-CR-4619
NAS 1.26:4619
権利No Copyright


このリポジトリに保管されているアイテムは、他に指定されている場合を除き、著作権により保護されています。