Cross-Correlation of C/A Codes in GPS/WAAS Receivers

A. J. Van Dierendonck, Gary A. McGraw, Robert J. Erlandson,Robert Coker

Abstract:	Recommendations have been made during recent Interna-tional Telecommunications Union (ITU) World Radio Conference (WRC) preparations that could limit the num-ber of C/A Code signals broadcast at the GPS L1 fre-quency because of concerns about possible cross-correlation interference. At the same time, there have been proposals made to increase the number of satellites broad-casting at that frequency, including Satellite Based Aug-mentation System (SBAS) satellites such as those used in the United States Wide Area Augmentation System (WAAS), the European Geostationary Navigation Overlay System (EGNOS), and the Japanese Multifunctional Transport Satellite Space-based Augmentation System (MSAS). These recommendations and proposals are con-flicting. This paper provides a new derivation of cross-correlation interference that avoids approximations used in previous analyses. This derivation shows that, although interference will occur, stronger interference is rare, and is even more rare to occur from multiple satellites at the same time. The conclusions are supported by careful labo-ratory measurements.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	581 - 596
Cite this article:	Van Dierendonck, A. J., McGraw, Gary A., Erlandson, Robert J., Coker, Robert, "Cross-Correlation of C/A Codes in GPS/WAAS Receivers," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 581-596.
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