This paper discusses the Navstar Global Positioning System, a space-based radio navigation system.
Written in 2003; 1,345 words; 14 sources; MLA; $ 45.95
Paper Summary:
This paper explains that the Navstar Global Positioning System (GPS), created in 1973 by the United States of America's Department of Defense and now operated by the U.S. Air Force, is a highly effective way to calculate, by using twenty-four space satellites in six different orbits, the exact location of a point on the earth. The author points out that, although the GPS was first invented and used mainly by the military, it is now used for nonmilitary applications from routing police and fire trucks on 911 emergency calls to finding directions for private automobile drivers. The paper relates that, over the past ten years, the price has decreased by up to 20 percent each year and continues to drop as the merchandise becomes more and more precise.
From the Paper:
"In 1978, when the first round of satellites were launched, the results were less than perfect, but today the system works the exact same way with almost terrifying accuracy. Even though the results have improved, the concept is the same. GPS, which is comparable to GLONASS, a similar system developed by the Soviet Union, is made up of three segments: the space, user, and control segments. The space segment, as previously stated, consists of twenty-four satellites (3 spares) that are located 20, 190 kilometers above the earth's surface in six orbital planes that cover the sphere of the earth evenly. They orbit in 12 hours; providing every place on earth with visibility to at least the four necessary satellites for the system to work. Also, for the polar areas to be viewed completely, the satellites are at a 55? angle to the equator."
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