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| Advanced Communications Technology Satellite ： ウィキペディア英語版 |
STS-51
STS-51 was a Space Shuttle ''Discovery'' mission that launched the Advanced Communications Technology Satellite (ACTS) in September 1993. The flight also featured the deployment and retrieval of the SPAS-ORFEUS satellite and its IMAX camera, which captured spectacular footage of ''Discovery'' in space. A spacewalk was also performed during the mission to evaluate tools and techniques for the STS-61 Hubble Space Telescope servicing mission later that year. STS-51 was the first shuttle mission to fly a GPS receiver, a Trimble TANS Quadrex. It was mounted in an overhead window where limited field of view and signal attenuation from the glass severely impacted receiver performance.〔(【引用サイトリンク】title=Analysis of the First Successful Flight of GPS Abroad the Space Shuttle )〕 (Full triple-redundant 3-string GPS would not happen until 14 years later with STS-118.)
==Crew==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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