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Discussion threads can be closed at any time at our discretion. Celebrating 10 years of GPS for the masses President Clinton's order to stop scrambling satellite signals paved the way for civilians to use GPS with the same accuracy as the military had long enjoyed. Dong Ngo. May 1, a. President Bill Clinton in It takes 24 satellites and several backup satellites orbiting the Earth at a height of more than 20, kilometers, to ensure that three satellites are available anywhere in the world and at any time.
Satellites transmit an uninterrupted signal detailing their current location and time, and it's up to the GPS receiver to handle the signal delay with the help of an integrated clock to calculate its own position and speed. Using distance measurements from three points, known as trilateration, exact positions are determined.
The signal from the first satellite determines the receiver's degree of longitude; the second identifies the degree of latitude. While every effort has been made to ensure the information in this blog post is timely and accurate, errors and omissions may occur, and the information presented here may become out-of-date with the passage of time.
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See also : What is GPS? Navy builds Transit system satellites to begin tracking submarines. The first fully operational satellite is launched by the U.
Air Force as a part of their Block II program.
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