Determination of C/A Code Self-Interference Using Cross-Correlation Simulations and Receiver Bench Tests

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

Abstract:	A research team, from Rockwell-Collins, AJ Systems, and Pythagorean Development, Inc., has developed a sophisticated model along with a set of test equipment and instrumentation to analyze multiple access interference among GPS and SBAS signals that use C/A codes. In FY99, this team developed a new derivation for a cross-correlation interference simulation model that avoided approximations used in previous analyses. In particular, the model also included signal data modulation (50 bps for GPS and 500-baud for Satellite Based Augmentation Systems -- SBAS). This derivation showed that, although interference will occur, significant interference is a rare occurrence, and the occurrence simultaneously from multiple SVs is even rarer. These conclusions were supported by careful laboratory measurements. In FY01 and 02, the team extended the simulation and laboratory testing to examine the impact of cross- correlation on different types of carrier-to-noise estimation schemes as well as the effect on C/A code pseudo-range measurement accuracy. The simulation and laboratory results show that with carrier smoothing of the code measurements, cross-correlation will have neglible effect on measurement accuracy for precision landing applications.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	630 - 642
Cite this article:	Van Dierendonck, A. J., Erlandson, Robert, McGraw, Gary, Coker, Robert, "Determination of C/A Code Self-Interference Using Cross-Correlation Simulations and Receiver Bench Tests," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 630-642.
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