Interoperability and Traditional Nav-aid Considerations for DGPS Standards

Lori Hill and Ken Ganther

Abstract:	In the coming year the subject of Category I/II/III Local Area Differential GPS (DGPS) requirements will be more closely examined for aircraft private and public use. This paper is the result of a study by Wilcox to evaluate Category I/II/III DGPS current standards with respect to possible in&operability between the ground station and airborne equipment, as well as conflicts with the traditional navigation standards and experiences. This paper presents possible resolutions and standards definitions to provide interoperability and to guarantee integrity and reliability that exist today in our traditional navigation devices. Considered are the following interoperability issues: unusable satellite definition, Acceleration Error Bound (AEB) definition, normalized Pseudorange Corrections (PRCs), working ground station definition. These interoperability issues primarily have an effect on ground equipment availability but also address some possible accuracy issues. Also considered in this paper is a study of traditional nav-aid principles that should be incorporated into DGPS standards. These principles have evolved over the long and successful history of traditional nav-aids in providing common everyday navigation around the world. These principles include the integrity of the total navigation solution, system architecture, Signal in Space (SIS) shadowing, approach guidance path and identification, guidance signal response time, monitor architecture, SIS integrity and failure warning time, monitor failure (monitor fail-safe), general comments on redundancy, and resistance to interference.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	807 - 814
Cite this article:	Hill, Lori, Ganther, Ken, "Interoperability and Traditional Nav-aid Considerations for DGPS Standards," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 807-814.
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