[1stPickSites] (09/08/05) Global Positioning System Primer

Global Positioning System Primer

http://www.aero.org/education/primers/gps/

The term GPS has entered the everyday lexicon but exactly what it
means and how it works, is less well-known. Today's site from the
U.S. Aerospace Corporation, which was closely involved in its
development, offers an excellent presentation on the basics of
this now essential navigation aid.

"GPS, which stands for Global Positioning System, is the only
system today able to show you your exact position on the Earth
anytime, in any weather, anywhere. ... GPS is one of history's
most exciting and revolutionary developments, and new uses for it
are constantly being discovered." - from an earlier website
presentation (Google cache)

The site offers an overview of the history of navigation, an
explanation of what GPS is and the components -- satellites,
ground stations and receivers -- of which it is comprised. The
"how it works" section uses text and helpful diagrams to
illustrate the "constellation of satellites" in the system, and
the order in which information is transmitted to a user's
receiver, to pinpoint a specific earth location. A useful
timeline outlines the development of GPS, while an additional
section highlights the military
and civilian uses of the system.

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