Proposed Operations Concepts and Flexible UE Architectures for Modernized User Equipment SIS Utilization for Transition from Test Mode to IOC through FOC

Raymond DiEsposti and Kevin Hsu

Abstract:	The first GPS IIR Modernized (IIR-M) satellite has been launched and declared operational. The IIR-M broadcasts a new civil signal on the L2 frequency band as well as new military M-code signals on L1 and L2. The GPS IIF satellites will add two additional signal components at the L5 frequency band. Future satellite blocks will include a new L1C signal, which is interoperable with the Galileo OS. The operations concept (OPSCON) associated with legacy GPS L1 C/A and L1 & L2 P(Y) code SIS user equipment (UE) utilization has been developed and refined over many years and is now well established. In this context, we define the OPSCON as the high-level functional procedures implemented by the user and automatically within the UE starting from pre turn-on, determining which signals to acquire and track, acquiring and tracking the signals, validating the signals, generating GPS ranging measurements, computing a navigation solution, utilizing the PVT information, and UE shutdown. Integration of GPS with other systems, e.g. wireless assist GPS or AGPS, has enabled modifications and enhancements of the OPSCON and performance relative to stand-alone GPS UE. We describe approaches for additional capabilities in the future as enabled by the Signal-in-Space (SIS) improvements associated with the modernized signals. Discussed in this paper are proposed high-level OPSCON for several UE configurations and applications. The OPSCON descriptions address the utilization of the modernized signals associated with SIS transition starting from the Test Mode and extending into modernized signals IOC and FOC. Flexible UE architectures are proposed to accommodate the SIS Modernization transition period, including the potential phase out of obsolete signals. We hope to provide some examples which will help designers and developers of modernized UE and integrated systems fully exploit the new capabilities associated with the modernized signals as they become available. To keep this paper releasable in a public forum, the content mainly addresses the modernized civilian signals and not the military signals. Note that this paper mainly includes discussion of the qualitative aspects of modernization and operations concepts rather than a quantitative assessment of performance. The reader is referred to the many other papers which address modernized system and signal performance.
Published in:	Proceedings of the 2007 National Technical Meeting of The Institute of Navigation January 22 - 24, 2007 The Catamaran Resort Hotel San Diego, CA
Pages:	548 - 560
Cite this article:	DiEsposti, Raymond, Hsu, Kevin, "Proposed Operations Concepts and Flexible UE Architectures for Modernized User Equipment SIS Utilization for Transition from Test Mode to IOC through FOC," Proceedings of the 2007 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2007, pp. 548-560.
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