Post Correlation CWI and Cross Correlation Mitigation Using Delayed PIC

Eamonn P. Glennon, Roderick C. Bryant, Andrew G. Dempster, and Peter J. Mumford

Abstract:	A number of different techniques are available to mitigate the problem of cross correlations caused by the limited dynamic range of the 10-bit Gold codes used for the GPS C/A codes. These techniques include Successive Interference Cancellation (SIC) and parallel-interference cancellation (PIC), where the strong signals are subtracted at IF prior to attempting to detect the weak signals. In this paper, a variation of these techniques is proposed whereby the subtraction process is delayed until after the correlation process, although still employing a pure reconstructed C/A code signal to permit prediction of the cross correlation process. This paper provides details on the method as well as showing the results obtained when the method was implemented in a hardware receiver on a large scale FPGA. The benefits of this approach are also described, as is the application of the method to the cancellation of CW interference.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	236 - 245
Cite this article:	Glennon, Eamonn P., Bryant, Roderick C., Dempster, Andrew G., Mumford, Peter J., "Post Correlation CWI and Cross Correlation Mitigation Using Delayed PIC," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 236-245.
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