The Minitrack Network, was the first U.S. satellite tracking{dn|date=December 2013} network to become operational, in 1957. It was used to track the flights of Sputnik, Vanguard, Explorer, and other early space efforts. Minitrack was the progenitor of Spacecraft Tracking and Data Acquisition Network (STADAN) and the Manned Space Flight Network (MS...
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http://en.wikipedia.org/wiki/Minitrack
A tracking network originally established for Vanguard tracking and data acquisition during the International Geophysical Year. It is now the basic network for tracking small scientific Earth satellites.
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http://www.daviddarling.info/encyclopedia/M/Minitrack.html
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