Algorithm and Assessment of Ambiguity-Fixed PPP with BeiDou Observations and Regional Network Augmentation
Publication: Journal of Surveying Engineering
Volume 146, Issue 2
Abstract
In precise point positioning (PPP) applications, uncalibrated phase delays (UPD) are applied to retrieve the ambiguity integers for achieving precise solutions over a short period. Also, the atmospheric corrections obtained from a dense reference network are applied to accomplish this task of shorter convergence time or even instantaneous ambiguity resolution. The combined BeiDou Navigation Satellite System (BDS) and Global Positioning System (GPS) PPP with regional network augmentation is presented with threefold contributions. First, in order to overcome the UPD-inherent unmodeled errors in undifferenced ambiguity resolution at reference stations, it is proposed to fix the single-differenced ambiguities and use them as a constraint to fix the undifferenced ambiguities. Second, the performance of combined PPP are fully evaluated with various indicators specified by single and combined satellite systems and several ratio test thresholds for ambiguity resolution. The BDS observations can provide the user with a significant improvement on the position solutions. The fix rate and correct fix rate are found to be increased by more than 7% and 11%, respectively. Third, the regional augmented PPP is assessed in a highly occluded urban canyon. The experiments show the unfix rates of the combined system are decreased by more than 40%, and the correct fix rates can be improved by up to 55% compared with a GPS-only scenario.
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Data Availability Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study is sponsored by National Natural Science Funds of China (41622401, 41874030, and 41574023), the Scientific and Technological Innovation Plan from Shanghai Science and Technology Committee (18511101801), and the National Key Research and Development Program of China (2016YFB0501802). Siyao Wan is supported by the China Scholarship Council.
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Published In
Journal of Surveying Engineering
Volume 146 • Issue 2 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jan 21, 2019
Accepted: Oct 2, 2019
Published online: Feb 26, 2020
Published in print: May 1, 2020
Discussion open until: Jul 26, 2020
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