Data Message Performance for the Future L1C GPS Signal

P.A. Dafesh, E.L. Valles, J. Hsu, D.J. Sklar, L.F. Zapanta, and C.R. Cahn

Abstract:	The L1 C signal is being designed to optimize performance of a variety of attributes of the modernized GPS satellites, including data demodulation. In order to provide the L1C signal with the most robust interleaving and forward error control (FEC) coding possible, a study was conducted to select an optimal interleaving and coding approach. This paper will describe the results of the L1C interleaving and coding study and the performance of the selected LDPC FEC code for L1C. The work will also describe the performance of the L1C data structure relative to other GNSS navigation signals employing convolutional coding. Lastly, the work will discuss the complexity of the LDPC coding and interleaving approaches and the combined impact of coding, interleaving, and carrier tracking on the ability to obtain the L1C GPS message in degraded signal conditions.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	2519 - 2528
Cite this article:	Dafesh, P.A., Valles, E.L., Hsu, J., Sklar, D.J., Zapanta, L.F., Cahn, C.R., "Data Message Performance for the Future L1C GPS Signal," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 2519-2528.
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