GLOBAL POSITIONING SYSTEM By Nathan Willett, Carlos Chersia, David Guarin, Gabriela Guapache
History 1960 April 13 The first navigation satellite TRANSIT IB is launched for use by the U.S. Navy in order to locate ballistic missile submarines and ships. May 15 Drs. Ivan Getting and Shep Arikin of Raytheon propose a radio-navigation system called MOSAIC (Mobile System for Accurate ICBM(intercontinental ballistic missiles) Control) to the U.S. Air Force.
History (Part 2) 1964-1966 Aerospace scientists and engineers conduct a series of satellite navigation studies within the company’s Systems Planning Division. These studies arrive at the operational concept for GPS as we know it today.(Tell you your location)
History (Part 3) 1978 Block I comprised 10 developmental satellites launched from 1978 through 1989. 1983 May 20 The Air Force signs a $1.2 billion contract for the production of 28 GPS Block II satellites with Rockwell Space Systems.
History (Part 4) September A Korean civilian airliner is shot down by Russian fighters after accidentally intruding into Soviet air space. To prevent any such tragedy from happening again, President Ronald Reagan declassifies NAVSTAR; GPS becomes available to civilians.
History (Part 5) 1991 The Persian Gulf War enables American military forces to validate the usefulness of GPS in combat situations. Although not fully operational, GPS allows the military to obtain accurate coordinates in the featureless Iraqi desert and to achieve a quick victory.
History (Part 6) 1994 January 17 The last of the Block IIA satellites is launched, completing the GPS constellation. 1995 April 27 Air Force Space Command declares the Block II NAVSTAR GPS constellation fully operational.
Arrangement and Numbers of Satellites The GPS system consists of 24 earth – orbiting satellites. 4 satellites are in each of 6 different orbital planes Each has an inclination of 55 degrees with respect to the earth’s equator.
How GPS has supported relativity It has supported it because of the General Relativity Theory. The clocks on GPS satellites look like they are going slower from our perspective here on earth.
How GPS has supported Relativivivity This would be a problem, but scientists are able to build systems into the satellite that allows it to correct itself by 45 microseconds per day.