GNSS User Assessment of the Plans and the Benefits of GNSS Modernized Signals and Services

A. J. Van Dierendonck

Abstract:	"First, this paper will address technical and policy arguments regarding GNSS Modernization (civil signals only Ð obviously, military signals have priority). There is a complex number of current and future civil signals: today -- L1 C/A, semi-codeless P(Y) L1 and L2 and augmentations; next, there is GPS Modernization -- L2C and L5, plus a possible future L1C (GPS-III). Then, there are the proposed Galileo open and safety-of-life service signals at L1 and E5. For GPS, these signals should NOT be thought of as being in competition with each other and/or to be traded off with respect to each other or with respect to Galileo. They all serve a purpose for civil users. The currently planned GPS Modernization sequence represents a carefully worked out path for upgrading the existing benefits of GPS to global users, while at the same time increasing the national security and public safety benefits to the nation, yet maintaining legacy signals for current users of GPS. Unfortunately, the launch of modernized GPS satellites, for the most part, must wait until the existing satellites reach the end of their service life. Galileo, on the other hand, has the luxury of launching new features with its first launch. This paper will give a brief description of each signal: L1 C/A (installed base); L2C, representing the maturation of codeless/semi-codeless L2; L5; a proposed GPS III L1C; and the proposed Galileo L1 and E5. This will be followed by the authorsÕ assessment of the compatibility and interoperability of proposed GPS and Galileo signals. Finally, GNSS compatibility issues and design decisions already made will be evaluated on both GPS and Galileo."
Published in:	Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005) June 27 - 29, 2005 Royal Sonesta Hotel Cambridge, MA
Pages:	201 - 209
Cite this article:	Van Dierendonck, A. J., "GNSS User Assessment of the Plans and the Benefits of GNSS Modernized Signals and Services," Proceedings of the 61st Annual Meeting of The Institute of Navigation (2005), Cambridge, MA, June 2005, pp. 201-209.
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