GPS L1C: Enhanced Performance, Receiver Design Suggestions, and Key Contributions

T. Stansell, K.W. Hudnut, R.G. Keegan

Abstract:	L1C, the new GPS L1 civil signal, is novel in important ways that significantly enhance PNT performance as well as interoperability with other GNSS signals. It will be broadcast by the GPS III block of satellites, with first launches as early as 2014 or 2015. Some of the novel features include: 75% of the signal power in the dataless pilot component, encoding blocks of data with an LDPC algorithm to enhance data demodulation, an overlay code to frame the data message, enhanced spreading codes to minimize crosscorrelation interference, a novel message structure to reduce time to first fix while allowing data demodulation with the weakest signal that can be tracked, a TMBOC waveform providing a wider RMS bandwidth (more code edges) for precision applications while maintaining excellent performance for narrow bandwidth consumer receivers, and interleaving of data symbols to minimize the effect of short signal fades. The benefits of each feature, how best to make use of each one, and how these features were developed are described.
Published in:	Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010) September 21 - 24, 2010 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	2860 - 2873
Cite this article:	Stansell, T., Hudnut, K.W., Keegan, R.G., "GPS L1C: Enhanced Performance, Receiver Design Suggestions, and Key Contributions," Proceedings of the 23rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2010), Portland, OR, September 2010, pp. 2860-2873.
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