Joined: 11/07/2002 14:36:40 Posts: 23774 Location: Hampshire, UK
Posted: Thu May 09, 2013 10:37 am Post subject: The first GPS NAVSTAR satellite - NTS-2 goes on display
The first ever GPS Navstar satellite, or at least the non-flying twin of it, has gone on display at the Smithsonian National Air and Space Museum.
NTS-2 was the first of a four vehicle fleet of satellites, built by the Naval Research Laboratory, to demonstrate navigation positioning using satellites.
Launched in June 1977 from Vandenberg Air Force Base in California, NTS-2 carried two caesium atomic clocks and demonstrated 'passive ranging, the all important ability to measure the distance from the receiver to the satellite.
Once you could achieve that, and had access to two or more satellites, you could calculate your position.
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