A New Carrier Phase Multipath Mitigation Technique for Ionosphere-free Combination

R. Moradi, W. Schuster, S. Feng, W. Ochieng

Abstract:	The ionosphere layer of the atmosphere impacts the speed of electromagnetic waves such as those used by Global Navigation Satellite Systems (GNSS). If dual frequency measurements are available, the dependency of ionospheric errors on the frequency can be exploited to remove a significant fraction of these errors using the ionosphere-free (IF) combination. However, although such combination reduces the ionosphere-induced errors significantly, it also magnifies the noise and multipath errors. A new IF multipath mitigation technique is developed in this paper. In this technique, mitigation is achieved by extracting Inter Frequency carrier Multipath (IFM) errors for Global Positioning System (GPS) L1 and L2 and removing them from the IF carrier phase observation. Three test scenarios with different baselines were conducted using real data sets collected in static mode, and post processed in Real-Time Kinematic (RTK) mode. By mitigating the multipath errors in the ionosphere-free combination using the new technique developed in this paper, the horizontal Root Mean Square (RMS) error was reduced by 27% to 45% and the horizontal mean errors were reduced by 25% to 33%.
Published in:	Proceedings of the 2014 International Technical Meeting of The Institute of Navigation January 27 - 29, 2014 Catamaran Resort Hotel San Diego, California
Pages:	562 - 567
Cite this article:	Moradi, R., Schuster, W., Feng, S., Ochieng, W., "A New Carrier Phase Multipath Mitigation Technique for Ionosphere-free Combination," Proceedings of the 2014 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2014, pp. 562-567.
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