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The Spacecraft Tracking and Data (Acquisition) Network (STADAN or STDN) was established by NASA to satisfy the requirement for long-duration, highly-available space-to-ground communications. Real-time operational control and scheduling of the network was provided by the Network Operations Control Center (NOCC) at the Goddard Space Flight Center (GSFC) in Greenbelt, Maryland.〔''STDN User's Guide'', Baseline Document, Rev. 2, Goddard Spaceflight Center: Greenbelt, MD, May 1974, p. 1-1〕 Consisting of parabolic dish antennas and telephone switching equipment deployed around the world, the STADAN provided space-to-ground communications for approximately 15 minutes of a 90-minute orbit period. This limited contact period sufficed for unmanned spacecraft, but manned spacecraft require a much higher data collection time. In May 1971 STADAN was consolidated with the Manned Space Flight Network (MSFN) to form the Spaceflight Tracking and Data Network (STDN).〔''STDN User's Guide'', Baseline Document, Rev. 2, Goddard Spaceflight Center: Greenbelt, MD, May 1974, p. 1-9〕 ==Stations== STADAN stations were at: * Greenbelt, Maryland, USA (ETC) - Network Operations Control Center * Orroral Valley, Canberra, Australia (ORR) * Carnarvon, Australia (CRO) * Cooby Creek, Toowoomba, Australia * Johannesburg, South Africa (BUR) * Tananarive, Madagascar (TAN) * East Grand Forks, Minnesota, USA * St Johns, Newfoundland, Canada (NFL) * Fort Myers, Florida, USA * Quito, Ecuador (QUI) * Lima, Peru * Santiago, Chile (AGO) * Antofagasta, Chile * Fairbanks, Alaska, USA (ULA) * Winkfield, England (WNK) * Rosman, North Carolina, USA (ROS) * Goldstone, California, USA (GDS) * Barstow, California, USA * Brown Field near Chula Vista, California, USA * Pakistan * Crete, Greece * Ascension Island, South Atlantic Ocean 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「Spacecraft Tracking and Data Acquisition Network」の詳細全文を読む スポンサード リンク
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