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Sensors 2017, 17(3), 507;

A Unified Model for BDS Wide Area and Local Area Augmentation Positioning Based on Raw Observations

4,* , 1,3
National Time Service Center, Chinese Academy of Sciences, Shu Yuan Road, Xi’an 710600, China
Key Laboratory of Precision Navigation and Timing Technology, Chinese Academy of Sciences, Shu Yuan Road, Xi’an 710600, China
College of earth sciences, University of Chinese Academy of Sciences, Yu Quan Road, Beijing 100049, China
Germany Research Center for Geosciences, Telegrafenberg, Potsdam 14473, Germany
Author to whom correspondence should be addressed.
Academic Editors: Cheng Wang, Julian Smit, Ayman F. Habib and Michael Ying Yang
Received: 7 January 2017 / Revised: 26 February 2017 / Accepted: 1 March 2017 / Published: 3 March 2017
(This article belongs to the Special Issue Multi-Sensor Integration and Fusion)
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In this study, a unified model for BeiDou Navigation Satellite System (BDS) wide area and local area augmentation positioning based on raw observations has been proposed. Applying this model, both the Real-Time Kinematic (RTK) and Precise Point Positioning (PPP) service can be realized by performing different corrections at the user end. This algorithm was assessed and validated with the BDS data collected at four regional stations from Day of Year (DOY) 080 to 083 of 2016. When the users are located within the local reference network, the fast and high precision RTK service can be achieved using the regional observation corrections, revealing a convergence time of about several seconds and a precision of about 2–3 cm. For the users out of the regional reference network, the global broadcast State-Space Represented (SSR) corrections can be utilized to realize the global PPP service which shows a convergence time of about 25 min for achieving an accuracy of 10 cm. With this unified model, it can not only integrate the Network RTK (NRTK) and PPP into a seamless positioning service, but also recover the ionosphere Vertical Total Electronic Content (VTEC) and Differential Code Bias (DCB) values that are useful for the ionosphere monitoring and modeling. View Full-Text
Keywords: BDS; PPP/RTK; local augmentation positioning; ambiguity resolution BDS; PPP/RTK; local augmentation positioning; ambiguity resolution

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Tu, R.; Zhang, R.; Lu, C.; Zhang, P.; Liu, J.; Lu, X. A Unified Model for BDS Wide Area and Local Area Augmentation Positioning Based on Raw Observations. Sensors 2017, 17, 507.

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