Reference : Towards PPP-RTK: Ambiguity Resolution in Real-Time Precise Point Positioning
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/10993/9803
Towards PPP-RTK: Ambiguity Resolution in Real-Time Precise Point Positioning
English
Geng, J. [University of Nottingham > Institute of Engineering Surveying and Space Geodesy]
Teferle, Felix Norman mailto [University of Nottingham > Institute of Engineering Surveying and Space Geodesy]
Meng, X. [University of Nottingham > Institute of Engineering Surveying and Space Geodesy]
Dodson, A. H. [University of Nottingham > Institute of Engineering Surveying and Space Geodesy]
2010
Advances in Space Research
Pergamon Press
1-5
Yes (verified by ORBilu)
International
0273-1177
Oxford
United Kingdom
[en] Precise Point Positioning ; Ambiguity Resolution ; Global Positioning System ; Uncalibrated Phase Delays ; Real-Time
[en] Integer ambiguity resolution at a single station can be achieved by introducing predetermined uncalibrated phase delays (UPDs) into the float ambiguity estimates of precise point positioning (PPP). This integer resolution technique has the potential of leading to a PPP-RTK (Real-Time Kinematic) model where PPP provides rapid convergence to a reliable centimeter-level positioning accuracy based on an RTK reference network. Nonetheless, implementing this model is technically subject to how rapidly we can fix wide-lane ambiguities, stabilize narrow-lane UPD estimates, and achieve the first ambiguity-fixed solution. To investigate these issues, we used seven days of 1-Hz sampling GPS data at 91 stations across Europe. We find that at least 10 minutes of observations are required for most receiver types to reliably fix about 90% of wide-lane ambiguities corresponding to high elevations, and over 20 minutes to fix about 90% of those corresponding to low elevations. Moreover, several tens of minutes are usually required for a regional network before a narrow-lane UPD estimate stabilizes to an accuracy of far better than 0.1 cycles. Finally, for hourly data, ambiguity resolution can significantly improve the accuracy of epoch-wise position estimates from 13.7, 7.1 and 11.4 cm to 0.8, 0.9 and 2.5 cm for the East, North and Up components, respectively, but a few tens of minutes is required to achieve the first ambiguity-fixed solution. Therefore, from the timeliness aspect, our PPP-RTK model currently cannot satisfy the critical requirement of instantaneous precise positioning where ambiguity-fixed solutions have to be achieved within at most a few seconds. However, this model can still be potentially applied to some near-real-time remote sensing applications, such as the GPS meteorology.
Researchers ; Professionals
http://hdl.handle.net/10993/9803
10.1016/j.asr.2010.03.030

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