Global Positioning System (GPS)
McDonald, Keith D. Navtech Consulting, Alexandria, Virginia.
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The Global Positioning System is a satellite-based system providing worldwide continuous position, velocity, time, and related data to civil and military users. It has a growing number of applications in the fields of marine, land, and aerospace navigation and precise time and time transfer, as in surveying, geodesy, and mapping; precision farming; air-traffic control; asset location and tracking; and timing of communication systems and power grids. Since the 1960s, GPS has grown from a navigation concept to an operational system of about 24 spacecraft (Fig. 1) serving millions of users. Over a million GPS receivers a year were produced during 1997–1999.
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