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The Minitrack Network, was the first U.S. satellite tracking 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 (MSFN). == Origins == When the proposals for satellites floated in the mid 1950s, the question of tracking them naturally arose. Three approaches were considered: *Optical tracking *Use of radar *A scheme from the United States Naval Research Laboratory (NRL) that measured angles using interferometry, based on work at the White Sands Missile Range. The optical and radar approaches did not require a cooperative target, but had the major problem of acquisition, or finding the target in the first place, since they had very small fields of view. The NRL proposal needed a transmitter on the target, but could easily measure a target anywhere in a wide field of view. The NRL proposal was accepted and turned into the basis of the Minitrack stations. From a NASA history document:〔Corliss, p. 17〕
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