Multipath Mitigation Using Circular Rotating Antenna

Lin Xie, Xiaowei Cui, Tianyi Ma, and Mingquan Lu

Abstract:	As we all know that multipath is one of the main error sources that degrade the quality of the Global Navigation Satellite System (GNSS) receiver observables. On the other hand, the use of Geostationary Earth Orbit (GEO) satellites in some of the systems results in extremely low multipath fading frequency which brings new challenge to multipath mitigation. The multipath of the GEO satellite has extremely low fading frequency, which makes some of the post-receiver-measurement-based multipath mitigation techniques ineffective. These traditional techniques are designed based on the characteristics of the multipath of Medium Earth Orbit (MEO) satellites, whose fading frequency is much higher than that of the GEO satellites. Based on the two-path environment with one direct path and one indirect path, we analyzed the characteristics of the multipath error and fading frequency caused by antenna circular rotation. Based on the relationship between the phase lock loop correlator output amplitude variation and the code multipath error when the antenna rotates, we proposed an amplitude-weighted code tracking loop that can reduce the code multipath error with low fading frequency which is hard to be remove by traditional loop filter. The experiments using the data from GNSS signal generator and the real data collected from the rotating platform verify our proposed method.
Published in:	Proceedings of the 30th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2017) September 25 - 29, 2017 Oregon Convention Center Portland, Oregon
Pages:	3898 - 3909
Cite this article:	Xie, Lin, Cui, Xiaowei, Ma, Tianyi, Lu, Mingquan, "Multipath Mitigation Using Circular Rotating Antenna," Proceedings of the 30th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2017), Portland, Oregon, September 2017, pp. 3898-3909. https://doi.org/10.33012/2017.15288
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