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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Atmospheric Neutral Density Experiment ： ウィキペディア英語版 Atmospheric Neutral Density Experiment The Atmospheric Neutral Density Experiment (ANDE) is an experiment using two spherical satellites to measure the effects of atmospheric drag on spacecraft. ANDE is part of the Space Test Program of the United States Department of Defense, and was deployed in September 2006 from the Space Shuttle ''Discovery''. ==Satellites== The two spacecraft used for the ANDE mission are the Mock ANDE Active (MAA) sphere (Navy-OSCAR 61) and the Fence Calibration (FCAL) sphere (OSCAR 62). These microsatellites, developed by the Naval Research Laboratory, will measure drag through the use of precision orbit determination. Ground based lasers will be used to track the orbits of the sphere to with a couple centimeters of accuracy. Perturbations caused by density gradients and winds will be backed out from these measurements. The two ANDE satellites are nearly perfect spheres; this was done to make the drag on the satellites independent of their orientation, and because the drag coefficient, optical cross-sections, and radar cross sections of spheres are well understood. Each spherical micro satellite was constructed using the novel technique of centrifugal casting. This manufacturing technique was advantageous due to its low cost and its ability to achieve the high tolerances necessary to make the sphere as round and smooth as possible. The ANDE MAA sphere is made from a proprietary alloy of AL 6061 that is castable, while the FCAL sphere is made from brass. The ANDE FCAL sphere has the distinction of being the only micro satellite to have its structure composed primarily of brass. The differences in materials and hence density and mass of the spheres will cause them to separate from each other along track over time. This separation will be measured and compared to predicted models of where the satellite should be based on computed models of the space environment. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Atmospheric Neutral Density Experiment」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.