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GPS Navigation

GPS Overview The Global Positioning System (GPS) is a constellation

of 24, or more, 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 GX receives this data stream and

GPS Navigation

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Apollo 65 Guía de usuario Pagina 223