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NAVSTAR satellite, 1986.


NAVSTAR satellite, 1986.
3 8 c m
actual image size: 32cm x 30cm


The NAVSTAR satellite is shown during a solar array panel deployment test. This navigational satellite, also know as GPS-12, uses the Global Positioning System with a constellation of 18 satellites giving the system an accuracy of about 6 metres. Each NAVSTAR transmits information about its position in orbit, together with precise time checks. Since the speed at which radio signals travel is constant, it is posible for a user to listen to the signals from a number of satellites and determine his own position by triangulation.

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© National Aeronautics & Space Administration / Science & Society

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