GPS Current Signal-in-Space Navigation Performance

Jack Taylor and Eric Barnes

Abstract:	This paper will present on overview of current GPS Signal-in-Space (SIS) Performance, as observed from operational data including Zero Age-of-Data User Range Error (ZAOD URE), Estimated Range Deviation (ERD), and As-Broadcast URE. First, SIS performance metrics will be discussed – how ZAOD URE measures the MCS estimation quality against NGA precise ephemeris data. Next, how MCS prediction quality is monitored will be presented, including a short discussion of ERD vs. URE. This will be followed by a short graphical presentation of recent OCS performance in both estimation and prediction. Finally, the paper will discuss some looming improvements and enhancements: Legacy Accuracy Improvement (Correlated Kalman Filter; Addition of NGA Monitor Station Data; Model Updates; Filter Tuning); Legacy to Architectural Evolution Program (AEP) – Enhanced Phased Operation Transition (EPOT).
Published in:	Proceedings of the 2005 National Technical Meeting of The Institute of Navigation January 24 - 26, 2005 The Catamaran Resort Hotel San Diego, CA
Pages:	385 - 393
Cite this article:	Taylor, Jack, Barnes, Eric, "GPS Current Signal-in-Space Navigation Performance," Proceedings of the 2005 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2005, pp. 385-393.
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