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The NASA Deep Space Network (DSN) is a world-wide network of large antennas and communication facilities, located in the United States (California), Spain (Madrid), and Australia (Canberra), that supports interplanetary spacecraft missions. It also performs radio and radar astronomy observations for the exploration of the solar system and the universe, and supports selected Earth-orbiting missions. DSN is part of the NASA Jet Propulsion Laboratory (JPL). Similar networks are run by Europe, Russia, China, India, and Japan. == General information == DSN currently consists of three deep-space communications facilities placed approximately 120 degrees apart around the Earth.〔 〕 They are: * the Goldstone Deep Space Communications Complex () outside Barstow, California. For details of Goldstone's contribution to the early days of space probe tracking, see Project Space Track; * the Madrid Deep Space Communication Complex (), west of Madrid, Spain; and * the Canberra Deep Space Communication Complex (CDSCC) in the Australian Capital Territory (), southwest of Canberra, Australia near the Tidbinbilla Nature Reserve. Each facility is situated in semi-mountainous, bowl-shaped terrain to help shield against radio frequency interference.〔(【引用サイトリンク】title=DSN:antennas )〕 The strategic 120-degree placement permits constant observation of spacecraft as the Earth rotates, and helps to make the DSN the largest and most sensitive scientific telecommunications system in the world. The DSN supports NASA's contribution to the scientific investigation of the Solar System: It provides a two-way communications link that guides and controls various NASA unmanned interplanetary space probes, and brings back the images and new scientific information these probes collect. All DSN antennas are steerable, high-gain, parabolic reflector antennas.〔 The antennas and data delivery systems make it possible to:〔 * acquire telemetry data from spacecraft. * transmit commands to spacecraft. * upload software modifications to spacecraft. * track spacecraft position and velocity. * perform Very Long Baseline Interferometry observations. * measure variations in radio waves for radio science experiments. * gather science data. * monitor and control the performance of the network. 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「NASA Deep Space Network」の詳細全文を読む スポンサード リンク
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