Civil Aviation Integrity Requirements for the Global Positioning System

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Abstract
An Integrity Working Group was formed on April 22, 1986 by RTCA Special Committee-159 to investigate and report on civil integrity problems relating to the use of the Global Positioning System by civil aviation. Although the self-checking and warning features built into GPS are adequate to meet military integrity requirements and to allow safe operation of DoD aircraft, more stringent safety requirements must be met for GPS to receive FAA approval for use by civil aviation in the National Airspace System. To establish integrity alarm limits and time-to-alarm requirements for GPS, the Integrity Working Group examined existing requirements already established for other navigation systems. A variety of GPS integrity monitoring techniques were then studied to determine for which phases of flight they would provide sufficient integrity to allow use of GPS by civil aviation. This paper summarizes the conclusions and recommendations of the Integrity Working Group.

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