The Trade-off Analysis of Performance Indicators in Navigation Messages Including Reduced CED

ByungHyun. Choi, Hyoungmin So, Donguk Kim

Abstract:	The applications of GNSS are continually expanding, and numerous nations are pursuing the development of additional signals and the enhancement of existing ones as part of ongoing modernization efforts. These initiatives include constellation expansion through the deployment of additional satellites, the development of advanced spacecraft incorporating next-generation technologies (e.g., GPS III, GLONASS K2), and the introduction of novel modulation methods such as Binary Offset Carrier (BOC) and its variants (e.g., TMBOC). In the domain of navigation messages, the Reduced Clock, Ephemeris, and Data (CED) approach has been implemented in Galileo I/NAV to reduce the time required to acquire a navigation solution. Additional research has investigated performance enhancements through the adoption of the Equinoctial Orbital Elements (EOE) coordinate system and the optimization of navigation message scheduling. Building upon these efforts, this paper focuses on navigation message modernization through the application of reduced CED. Specifically, it examines the trade-offs associated with navigation message performance indicators and proposes strategies for its effective utilization in future systems.
Published in:	Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025) September 8 - 12, 2025 Hilton Baltimore Inner Harbor Baltimore, Maryland
Pages:	944 - 952
Cite this article:	Choi, ByungHyun., So, Hyoungmin, Kim, Donguk, "The Trade-off Analysis of Performance Indicators in Navigation Messages Including Reduced CED," Proceedings of the 38th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2025), Baltimore, Maryland, September 2025, pp. 944-952. https://doi.org/10.33012/2025.20408
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