Simulated Performance of Multiple-signal and Multiple-system Positioning for Land Vehicle Navigation

Wei Cao, Kyle O'Keefe, Mark Petovello and M. Elizabeth Cannon

Abstract:	The modernized GPS and planned GALILEO will provide civil users with multiple signals (or frequencies). In this paper, the navigation performance based on code and phase measurements is investigated for land vehicle users in the continental United States and Southern Canada. For codebased positioning, the availability, accuracy and reliability are estimated with different signal scenarios for GPS, GALILEO and their combined systems through software simulation. The simulation results are presented using Horizontal Dilution of Precision (HDOP) as a measure of availability and accuracy and maximum Horizontal Position Error (HPE) due to a single marginally detectable blunder as a measure of reliability. It is shown that the future GNSS signals demonstrate better performance than the legacy signals while the GPS/GALILEO combined system offers a great improvement in terms of reliability. For phase-based positioning, the reliability of integer ambiguity resolution in terms of probability of correct fix is studied and analyzed for various frequency and system combinations. It is shown that GALILEO has better performance compared to GPS within the same baseline and identical ionospheric and tropospheric conditions when single-, dual- and triple-frequency receivers are simulated, respectively. The combination of two systems has even further advantages: use of dual-frequency GPS/GALILEO together outperforms triple-frequency GPS or GALILEO alone in terms of time required for the float ambiguity solution to converge to a given level of probability of correct fix.
Published in:	Proceedings of the 2008 National Technical Meeting of The Institute of Navigation January 28 - 30, 2008 The Catamaran Resort Hotel San Diego, CA
Pages:	603 - 613
Cite this article:	Cao, Wei, O'Keefe, Kyle, Petovello, Mark, Cannon, M. Elizabeth, "Simulated Performance of Multiple-signal and Multiple-system Positioning for Land Vehicle Navigation," Proceedings of the 2008 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2008, pp. 603-613.
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