Signal Deformations On Nominally Healthy GPS Satellites

Alexander M. Mitelman, R. Eric Phelts, Dennis M. Akos, Samuel P. Pullen and Per K. Enge

Abstract:	This paper describes the collection and analysis of real data from twenty-four current, nominally healthy GPS satellites in the context of the ICAO second-order step (2OS) fault model. A simple but novel method is presented for averaging multiple C/A code epochs together, using Doppler prediction to achieve essentially open-loop synchronous sampling of the code waveform. This yields a clean picture of the C/A code edge transitions. Two different methods are then used to estimate the digital failure mode parameter, that characterizes each observed satellite within the context of the 2OS model. The results of this analysis are grouped by satellite block and, separately, by the type of frequency standard in operation at the time of measurement. Finally, the potential implications of these measurements on integrity and continuity are discussed.
Published in:	Proceedings of the 2004 National Technical Meeting of The Institute of Navigation January 26 - 28, 2004 The Catamaran Resort Hotel San Diego, CA
Pages:	0 - 0
Cite this article:	Mitelman, Alexander M., Phelts, R. Eric, Akos, Dennis M., Pullen, Samuel P., Enge, Per K., "Signal Deformations On Nominally Healthy GPS Satellites," Proceedings of the 2004 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2004, pp. 0-0.
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