United States Department of Transportation
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Abstract:Currently, the Federal Aviation Administration (FAA) relies principally on a ground-based navigation system that uses various types of equipment to assist pilots in navigating their assigned routes and to provide them with guidance for landing their aircraft safely in different types of weather. However, this ground-based navigation system is aging and limited in its geographic coverage. FAA is planning a transition from its ground-based navigation system to a satellite-based system using radio signals generated by the Global Positioning System (GPS) to provide greater geographic coverage, among other things. The Department of Defense developed GPS to support military missions and functions. However, the system is now a dual-use system, and other users?pilots, truckers, and boaters?rely on signals from the GPS satellites to calculate their time, speed, and position
anywhere on or above the earth?s surface. As part of its efforts to maintain GPS and make it more useful for civilians, in May 2000, Defense ceased its practice of intentionally degrading the accuracy of the GPS signal available for civil use. Furthermore, Defense plans to begin gradually replacing the existing satellites with new ones that will also improve system performance.
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