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Introduction to GPS Navigation

GPS

Overview

The Global Positioning System (GPS) is a

constellation of 24 satellites in six orbit lanes

10,898 nautical miles above the earth at an

inclination angle of about 55 degrees from the

equator. Each satellite orbits the earth twice in 24

hours.

The GPS was developed and the satellites launched

by the U.S. Department of Defense with the original

intent of supplying highly accurate position fix

information for military applications. In recent

years, commercial applications for the information

provided by this system have steadily increased in

the civilian sector. Some of the more popular

civilian uses of the system include surveying and

position fix data recording for civil engineering

applications, and a broad range of marine, aviation,

and terrestrial navigation applications.

While orbiting the earth, each GPS satellite

transmits complex streams of data containing the

operational status and orbital location of all the

satellites in the system. The Apollo SL50/60

Introduction to GPS Navigation

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