Tricode Hexaphase Modulation for GPS

Srini H. Raghavan, Jack K. Holmes, Steve Lazar, Martin Bottjer

Abstract:	In this paper a proposed new GPS signal scheme is described that provides for the simultaneous modulation of the C/A-code, the P(Y)-code, and a new military code (n-code), all on a single carrier for GPS use. This modulation scheme can be utilized on both the L1 and L 2 frequencies. The biggest advantage of this modulation method is that it provides sufficient spectral isolation between the civil and military signals, allowing both user groups to co-exist in the same frequency band. Another advantage of this concept is that it allows for backward compatibility with the existing military and commercial receivers while providing an additional C/A-code on the L 2 carrier. This signal scheme also appears to be compatible with the current codeless techniques used in the GPS receivers. Results obtained through laboratory tests are presented. In addition, signal generation and receiver design are discussed.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	385 - 397
Cite this article:	Raghavan, Srini H., Holmes, Jack K., Lazar, Steve, Bottjer, Martin, "Tricode Hexaphase Modulation for GPS," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 385-397.
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