| 词条 | Space Network |
| 释义 |
Satellite generationsTracking and Data Relay Satellite (TDRS) currently consists of first generation (F1–F7), and second generation (F8–F10) satellites. The space segment of the SN consists of up to six operational relay satellites in geosynchronous orbit. These communications satellites are allocated longitudes for relaying forward and return service signals to and from customers, any entity with an Earth-orbiting satellite that has an agreement with SN to use its communications services, for data transfer and tracking. An additional TDRS, F1, provides dedicated support to the National Science Foundation (NSF) through the use of the WSC Alternate Relay Terminal (WART). Additional spare TDRSs may be in geosynchronous orbit. All first generation TDRSs (F1–F7, also known as TDRS A–G) carry functionally identical payloads and all second generation TDRSs (F8–F10, also known as TDRS H–J) carry functionally identical payloads.{{citation needed|date=December 2010}} A third generation, TDRS K and L, are planned for launch 2012–2013. See TDRS launch history.{{citation needed|date=December 2010}} Click on the figures to the right, which identify the pertinent communications components and associated parameters of the orbiting relay platforms. CoverageFor spacecraft operating in a low earth orbit (LEO) 73 km to 3000 km altitude, the SN is capable of providing tracking and data acquisition services over 100% of the spacecraft’s orbit.[2] Spacecraft sent to more distant or exotic destinations rely on either Deep Space Network or their own custom, dedicated networks. See also
References1. ^{{cite book| title =Space Network User's Guide (SNUG), 2.3.2.1, Dedicated Ground Elements | edition = Rev 9| last = NASA| first = Exploration and Space Communications Projects Division |author2=Goddard Space Flight Center | year = August 2007 | publisher = National Aeronautics and Space Administration| id =450-SNUG | pages = }} 2. ^{{cite book| title =Space Network User's Guide (SNUG), 1.1.2, Scope, and 2.3.1.2, TDRS Line-of-Sight Coverage| edition = Rev 9| last = NASA| first = Exploration and Space Communications Projects Division |author2=Goddard Space Flight Center | year = August 2007 | publisher = National Aeronautics and Space Administration| id =450-SNUG | pages = }} External links
1 : Goddard Space Flight Center |
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