GPS Architecture Evaluations Based on Algorithmic Service Volume Model

K. Johnson, D. Diefes

Abstract:	A customized Service Volume Model (SVM) has been developed to support evaluation of operational characteristics for future GPS and Wide Area Augmentation Systems (WAAS) architectures. An optimal GPS architecture can be derived using SVM, based on the accuracy, continuity and integrity requirements of both military and civil users. Performance metrics for a variety of architectures, measures of service availability and navigation accuracy are presented. The SVM design facilitates examination and integration with space, control and user segment models. These models may be custom configurations, third-party COTS S/W or externally developed representations. Therefore, SVM applicability can be expanded to analyze a variety of GPS design issues. Sub-segment models can be compared and evaluated to identify differences in model fidelity. Recent additions to SVM include an intersatellite crosslink model with an Autonav option, a spot beam performance model, and a more robust integrity model. Sensitivity studies evaluating the design changes influencing different architectures are being conducted to better represent and understand the range of factors that affect the GPS performance, including augmentation, integrity, accuracy, continuity, and availability. These studies will also be a key in the development of additional system requirements and segment allocations.
Published in:	Proceedings of the 2003 National Technical Meeting of The Institute of Navigation January 22 - 24, 2003 Disneyland Paradise Pier Hotel Anaheim, CA
Pages:	513 - 520
Cite this article:	Johnson, K., Diefes, D., "GPS Architecture Evaluations Based on Algorithmic Service Volume Model," Proceedings of the 2003 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2003, pp. 513-520.
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