Global Positioning System Analysis of a National Approach to Augmented GPS Service

Ronald L. Ketchum and Robert O. DeBolt

Abstract:	The Institute for Telecommunication Sciences (ITS) of the National Telecommunications and Information Administration (NTIA) is conducting a study to investigate and analyze the use of the NAVSTAR Global Positioning System (GPS), Standard Positioning System (SPS) with augmentation. Augmented GPS is expected to meet the navigation and positioning needs of the operating administrations of the U.S. Department of Transportation (DOT). Augmented GPS may also meet most, if not all, positioning needs of the U.S. public and private users outside the DOT. The augmentations being considered are one or more of a number of applications, such as wide area/local area differential GPS (WADGPS/LADGPS), beacons, dead reckoning, map matching, etc. This study will evaluate the capabilities of augmented GPS applications considering a variety of factors and determine the optimum integrated system for meeting the requirements and needs of aviation, marine, and land users. In order to prevent an undesirable proliferation of different Federally funded GPS augmentations, to keep development and implementation costs as low as practical, and to keep user costs at reasonable levels, the current augmented GPS systems available, systems planned, and those under development will be examined. Existing GPS augmentations (public, private, and foreign) will be examined for their ability to meet the accuracy, availability, integrity requirements, and operational needs of DOT operating administrations. The conclusions and recommendations of the study will provide an independent expert opinion to DOT to assist in its determination of which GPS augmentation(s) it should continue to support and implement. Factors bearing on the determination of which GPS augmentation(s) to be supported and implemented are: ability to meet the user requirements and needs of the operating administrations and other users; cost of Federal development and deployment; user cost; effect on proliferation of government funded GPS augmentation(s); and the ability to satisfy the national security requirements regarding hostile exploitation of augmentation services. This study may also be used to provide guidance and recommendations, where appropriate, to other Federal agencies which are investigating the use of, or are operating, GPS augmentations.
Published in:	Proceedings of the 50th Annual Meeting of The Institute of Navigation (1994) June 6 - 8, 1994 Antlers Doubletree Hotel Colorado Springs, CO
Pages:	25 - 30
Cite this article:	Ketchum, Ronald L., DeBolt, Robert O., "Global Positioning System Analysis of a National Approach to Augmented GPS Service," Proceedings of the 50th Annual Meeting of The Institute of Navigation (1994), Colorado Springs, CO, June 1994, pp. 25-30.
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