Novel Algorithm to Exclude Multipath Satellites by Dual Frequency Measurements in RTK-GPS

Taro Kashiwayanagi, Teppei Sekizawa, Tetsushi Yamada, Katsuo Yui and Mikio Nakamura

Abstract:	RTK positioning is necessary for the next generation car navigation systems including driver’s aid such as anticollision systems or automated driving control systems. For applied to car navigation, the RTK positioning undergoes the deterioration of the received signal because of multipath from buildings in urban area. The signal deterioration necessitates monitoring techniques for multipath errors in carrier phase measurements. We have devised a novel RTK positioning algorithm that monitors the multipath errors and prevents position accuracy deterioration. The multipath monitoring algorithm is based on merely the carrier phase measurements of dual frequency, and is advantageous because it is applicable to each receiver and each satellite separately. The positioning algorithm excludes the satellites containing multipath error, suppressing position accuracy deterioration. We have evaluated the multipath monitoring algorithm and RTK positioning with the exclusion of multipath satellites by field experiments. Our evaluation shows that our multipath monitoring algorithm correctly detects the multipath satellites, and that the deterioration of positioning accuracy is suppressed by the exclusion of multipath satellites.
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:	1741 - 1747
Cite this article:	Kashiwayanagi, Taro, Sekizawa, Teppei, Yamada, Tetsushi, Yui, Katsuo, Nakamura, Mikio, "Novel Algorithm to Exclude Multipath Satellites by Dual Frequency Measurements in RTK-GPS," 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. 1741-1747.
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