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Article

Improving the Performance of Multi-GNSS (Global Navigation Satellite System) Ambiguity Fixing for Airborne Kinematic Positioning over Antarctica

1
GFZ German Research Centre for Geosciences, Telegrafenberg, 14473 Potsdam, Germany
2
Department of Geodesy and Geoinformation Science, Technical University of Berlin, 10623 Berlin, Germany
3
Institute of Space Science, Shandong University, Weihai 264209, China
4
School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(8), 992; https://doi.org/10.3390/rs11080992
Received: 13 March 2019 / Revised: 14 April 2019 / Accepted: 23 April 2019 / Published: 25 April 2019
(This article belongs to the Special Issue Global Navigation Satellite Systems for Earth Observing System)
Conventional relative kinematic positioning is difficult to be applied in the polar region of Earth since there is a very sparse distribution of reference stations, while precise point positioning (PPP), using data of a stand-alone receiver, is recognized as a promising tool for obtaining reliable and accurate trajectories of moving platforms. However, PPP and its integer ambiguity fixing performance could be much degraded by satellite orbits and clocks of poor quality, such as those of the geostationary Earth orbit (GEO) satellites of the BeiDou navigation satellite system (BDS), because temporal variation of orbit errors cannot be fully absorbed by ambiguities. To overcome such problems, a network-based processing, referred to as precise orbit positioning (POP), in which the satellite clock offsets are estimated with fixed precise orbits, is implemented in this study. The POP approach is validated in comparison with PPP in terms of integer ambiguity fixing and trajectory accuracy. In a simulation test, multi-GNSS (global navigation satellite system) observations over 14 days from 136 globally distributed MGEX (the multi-GNSS Experiment) receivers are used and four of them on the coast of Antarctica are processed in kinematic mode as moving stations. The results show that POP can improve the ambiguity fixing of all system combinations and significant improvement is found in the solution with BDS, since its large orbit errors are reduced in an integrated adjustment with satellite clock offsets. The four-system GPS+GLONASS+Galileo+BDS (GREC) fixed solution enables the highest 3D position accuracy of about 3.0 cm compared to 4.3 cm of the GPS-only solution. Through a real flight experiment over Antarctica, it is also confirmed that POP ambiguity fixing performs better and thus can considerably speed up (re-)convergence and reduce most of the fluctuations in PPP solutions, since the continuous tracking time is short compared to that in other regions. View Full-Text
Keywords: PPP; double-difference; ambiguity fixing; orbit error; global network; GPS; GLONASS; Galileo; Beidou PPP; double-difference; ambiguity fixing; orbit error; global network; GPS; GLONASS; Galileo; Beidou
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MDPI and ACS Style

Li, M.; Xu, T.; Flechtner, F.; Förste, C.; Lu, B.; He, K. Improving the Performance of Multi-GNSS (Global Navigation Satellite System) Ambiguity Fixing for Airborne Kinematic Positioning over Antarctica. Remote Sens. 2019, 11, 992. https://doi.org/10.3390/rs11080992

AMA Style

Li M, Xu T, Flechtner F, Förste C, Lu B, He K. Improving the Performance of Multi-GNSS (Global Navigation Satellite System) Ambiguity Fixing for Airborne Kinematic Positioning over Antarctica. Remote Sensing. 2019; 11(8):992. https://doi.org/10.3390/rs11080992

Chicago/Turabian Style

Li, Min; Xu, Tianhe; Flechtner, Frank; Förste, Christoph; Lu, Biao; He, Kaifei. 2019. "Improving the Performance of Multi-GNSS (Global Navigation Satellite System) Ambiguity Fixing for Airborne Kinematic Positioning over Antarctica" Remote Sens. 11, no. 8: 992. https://doi.org/10.3390/rs11080992

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