Augmentation Systems: The Use of Global Positioning System (GPS) in Aviation

Augmentation Systems: The Use of Global Positioning System (GPS) in Aviation

Mohammad S. Sharawi (King Fahd University of Petroleum and Minerals, Saudi Arabia)
DOI: 10.4018/978-1-60960-887-3.ch016
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The global positioning satellite system (GPS) has been utilized for commercial use after the year 2000. Since then, GPS receivers have been integrated for accurate positing of ground as well as space vehicles. Almost all aircrafts nowadays rely on GPS based system for their take off, landing, and en-route navigation. Relying on GPS alone does note provide the meter level accuracy needed to guarantee safe operation of aircrafts. Thus several augmentation systems have been deployed worldwide to enhance the accuracy of the GPS system. Several augmentation systems that serve local as well as wide coverage areas are discussed in this chapter, specifically the LAAS system, the WAAS system as well as the EGNOS system. The architecture as well the performance metrics for each of these augmentation systems are presented and discussed.
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The Local Area Augmentation System (Laas)

The Local Area Augmentation System (LAAS) is an augmentation between the satellite based Global Positioning System (GPS) service with ground based stations to provide accurate correcting information for aircraft landing and approach in airports. The initiative was proposed by the Federal Aviation Administration (FAA) in late 1990's. LAAS has to meet stringent requirements that will provide accuracy, integrity, continuity and availability of service for aircrafts during their final approaches to airports which require the greatest safety and reliability. It relies on local area differential GPS (DGPS) for horizontal and vertical position fixing that is broadcasted to aircrafts in the airport vicinity to enhance positioning accuracy.

LAAS has been deployed in several airports around the continental USA, and is currently under heavy investigation to meet the stringent requirements of the three categories of precision approach and landing in airports.

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