Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-8837
Main Title: Improving the Performance of Multi-GNSS (Global Navigation Satellite System) Ambiguity Fixing for Airborne Kinematic Positioning over Antarctica
Author(s): Li, Min
Xu, Tianhe
Flechtner, Frank
Förste, Christoph
Lu, Biao
He, Kaifei
Type: Article
Language Code: en
Abstract: 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.
URI: https://depositonce.tu-berlin.de/handle/11303/9816
http://dx.doi.org/10.14279/depositonce-8837
Issue Date: 25-Apr-2019
Date Available: 15-Aug-2019
DDC Class: 600 Technik, Technologie
Subject(s): PPP
double-difference
ambiguity fixing
orbit error
global network
GPS
GLONASS
Galileo
Beidou
License: https://creativecommons.org/licenses/by/4.0/
Journal Title: Remote Sensing
Publisher: MDPI
Publisher Place: Basel
Volume: 11
Issue: 8
Article Number: 992
Publisher DOI: 10.3390/rs11080992
EISSN: 2072-4292
Appears in Collections:FG Physikalische Geodäsie » Publications

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