Global Positioning System (GPS) Time Dissemination for Real-Time Applications

Authors:
Peter H. Dana
Affiliations:
Department of Geography, University of Texas at Austin, Austin TX 78712-1098 Consultant, P. O. Box 1297, Georgetown, TX 78627/ E-MAIL pdana@mail.utexas.edu
Venue:
Real-Time Systems - Special issue on global time in large scale distributed real-time systems, part I
Year:
1997

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Abstract

This paper presents an overview of theGlobal Positioning System (GPS) for the potential precise timeand time interval user with special reference to real-time systems.An overview of GPS operation is presented, and GPS error sourcesare described as they relate to the timing user. A review ofreceiver types and receiver tasks provides the basis for understandingGPS time transfer techniques. The accuracies provided by differenttechniques are reviewed and the special requirements for GPStime and frequency receivers as well as modern timing receiverenhancements are described. The precise time standard providedby GPS is traced through its path from global standards to theuser application. GPS time dissemination failure modes that resultfrom control problems, space craft failures, and receiver failuresare outlined.