| Abstract: | Detailed design of the modernized LI civil signal (L1C) signal has been completed, and the resulting draft Interface Specification IS-GPS-800 was released in Spring 2006. The novel characteristics of the optimized L1C signal design provide advanced capabilities while offering to receiver designers considerable flexibility in how to use these capabilities. L1C provides a number of advanced features, including: 75% of power in a pilot component for enhanced signal tracking, advanced Weilbased spreading codes, an overlay code on the pilot that provides data message synchronization, support for improved reading of clock and ephemeris by combining message symbols across messages, advanced forward error control coding, and data symbol interleaving to combat fading. The resulting design offers receiver designers the opportunity to obtain unmatched performance in many ways. This paper describes the design of L1C. A summary of LIC‘s background and history is provided. The signal description then proceeds with the overall signal structure consisting of a pilot component and a carrier component. The new L1C spreading code family is described, along with the logic used for generating these spreading codes. Overlay codes on the pilot channel are also described, as is the logic used for generating the overlay codes. Spreading modulation characteristics are summarized. The data message structure is also presented, showing the format for providing time, ephemeris, and system data to users, along with features that enable receivers to perform code combining. Encoding of rapidly changing time bits is described, as are the Low Density Parity Check codes used for forward error control of slowly changing time bits, clock, ephemeris, and system data. The structure of the interleaver is also presented. A summary of L 1C‘s unique features and their benefits is provided, along with a discussion of the plan for L1C implementation. |
| Genre: | Conference Paper |
| ProdID: | 70028684 |
| Citation Author: | Betz, J. W.; Blanco, M. A.; Cahn, C. R.; Dafesh, P. A.; Hegarty, C. J.; Hudnut, K. W.; Kasemsri, V.; Keegan, R.; Kovach, K.; Lenahan, L. S.; Ma, H. H.; Rushanan, J. J.; Sklar, D.; Stansell, T. A.; Wang, C. C.; Yi, S. K. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 2091 |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Proceedings of the Institute of Navigation - 19th International Technical Meeting of the Satellite Division, ION GNSS 2006 |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 12 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Description of the L1C signal; 2006; Conference Paper; Proceedings of the Institute of Navigation - 19th International Technical Meeting of the Satellite Division, ION GNSS 2006; Betz, J. W.; Blanco, M. A.; Cahn, C. R.; Dafesh, P. A.; Hegarty, C. J.; Hudnut, K. W.; Kasemsri, V.; Keegan, R.; Kovach, K.; Lenahan, L. S.; Ma, H. H.; Rushanan, J. J.; Sklar, D.; Stansell, T. A.; Wang, C. C.; Yi, S. K. |
| Citation Start Page: | 2080 |
| Citation Volume: | 4 |
| Citation Year: | 2006 |
| Type: | citation/reference |
| Text: | Description of the L1C signal; 2006; Conference Paper; Proceedings of the Institute of Navigation - 19th International Technical Meeting of the Satellite Division, ION GNSS 2006; Betz, J. W.; Blanco, M. A.; Cahn, C. R.; Dafesh, P. A.; Hegarty, C. J.; Hudnut, K. W.; Kasemsri, V.; Keegan, R.; Kovach, K.; Lenahan, L. S.; Ma, H. H.; Rushanan, J. J.; Sklar, D.; Stansell, T. A.; Wang, C. C.; Yi, S. K. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 2006 00:00 -0600 |
| Publisher: | |
