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Late fifties

  • 2014-03-05
  • 47.31KB
  • Points it Requires : 2

In the late 1950s, the former Soviet Union launched the first artificial earth satellite. American scientists discovered the Doppler frequency shift phenomenon in their tracking and research, and used this principle to build the Doppler satellite navigation and positioning system TRANST, which has achieved great success in military and civilian fields and is a leap in the history of navigation and positioning. In order to improve the accuracy of satellite positioning, the United States began to build the Global Positioning System GPS in 1973.

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