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Sensors 2018, 18(11), 3922; https://doi.org/10.3390/s18113922

Fast Phase-Only Positioning with Triple-Frequency GPS

1
Department of Spatial Sciences, Curtin University, Perth 6845, Australia
2
School of Astronautics, Beihang University, Beijing 100191, China
3
Department of Geoscience and Remote Sensing, Delft University of Technology, Delft 2628, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 15 October 2018 / Revised: 5 November 2018 / Accepted: 8 November 2018 / Published: 14 November 2018
(This article belongs to the Section Remote Sensors)
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Abstract

In this contribution, we study the phase-only ambiguity resolution and positioning performance of GPS for short baselines. It is well known that instantaneous (single-epoch) ambiguity resolution is possible when both phase and code (pseudorange) data are used. This requires, however, a benign multipath environment due to the severe effects multipath has on the code measurements. With phase-only processing, one would be free from such severe effects, be it that phase-only processing requires a change in receiver-satellite geometry, as a consequence of which it cannot be done instantaneously. It is thus of interest to know how much change in the relative receiver-satellite geometry is needed to achieve successful phase-only ambiguity resolution with correspondingly high precision baseline solutions. In this contribution, we study the two-epoch phase-only performance of single-, dual-, and triple-frequency GPS for varying time spans from 60 s down to 1 s. We demonstrate, empirically as well as formally, that fast phase-only very-precise positioning is indeed possible, and we explain the circumstances that make this possible. The formal analyses are also performed for a large area including Australia, a part of Asia, the Indian Ocean, and the Pacific Ocean. We remark that in this contribution "phase-only" refers to phase-only measurements in the observation model, while the code data are thus only used to compute the approximate values needed for linearizing the observation equations. View Full-Text
Keywords: GPS; phase-only; ambiguity resolution; Ambiguity Dilution of Precision (ADOP); success-rate GPS; phase-only; ambiguity resolution; Ambiguity Dilution of Precision (ADOP); success-rate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, K.; Chen, P.; Teunissen, P.J.G. Fast Phase-Only Positioning with Triple-Frequency GPS. Sensors 2018, 18, 3922.

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