GPS NOTAM Procedures

Mark A. Miller, Ronald M. Ward, Karen L. Van Dyke

Abstract:	Use of GPS for supplemental airborne navigation requires that the system to have the ability to detect when a satellite is out of tolerance and should not be used in the navigation solution. This capability will be provided by Receiver Autonomous Integrity Monitoring @AIM). R4IM will not be available 100% of the time, even with a fully operational GPS constellation, due to the constraints placed on the algorithm. However, with the aid of computer analysis, these outages can be predicted in advance and then reported to pilots during the pre- flight planning process. The DOD, represented by the Air Force Flight Standards Agency (AFFSA), is proceeding on a two phase approach in providing GPS outage information to the military aviation community. Existing procedures of the joint DOD/FAA Notice to Airmen (NOTAM) system will be used to disseminate this information. The Phase I GPS NOTAM system involves reporting satellite vehicle outages only. Phase I procedures were developed in coordination with the Federal Aviation Administration (FAA), Air Force Space Command (AFSPACECOM), and AFFSA. This service began October 28, 1993 and is available to both civilian and military users. Phase II is currently planned for DOD distribution only. It will include the Phase I capability and will also provide site specific NOTAMs based on the availability of GPS integrity for nonprecision approaches at flight planned destinations.
Published in:	Proceedings of the 1994 National Technical Meeting of The Institute of Navigation January 24 - 26, 1994 Catamaran Resort Hotel San Diego, CA
Pages:	323 - 327
Cite this article:	Miller, Mark A., Ward, Ronald M., Van Dyke, Karen L., "GPS NOTAM Procedures," Proceedings of the 1994 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1994, pp. 323-327.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In