Robust, Multi-Constellation, Multi-Frequency Precise Point Positioning For Instantaneous cm-level Positioning

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dc.contributor.advisorSunil B Bisnath
dc.contributor.authorAdu, Benjamin
dc.date.accessioned2025-07-23T15:12:19Z
dc.date.available2025-07-23T15:12:19Z
dc.date.copyright2025-03-26
dc.date.issued2025-07-23
dc.date.updated2025-07-23T15:12:19Z
dc.degree.disciplineEarth & Space Science
dc.degree.levelMaster's
dc.degree.nameMSc - Master of Science
dc.description.abstractAchieving instantaneous centimetre-level 3D accuracy for Global Navigation Satellite System (GNSS) multi-constellation, multi-frequency Precise Point Positioning (PPP) with ambiguity resolution without local augmentation poses significant challenges due to multipath, atmospheric refraction, and hardware noise. This research reduces York-PPP engine limitations by separating the BeiDou-2 and BeiDou-3 GNSS constellations clock terms in the design matrix and expanding the uncombined Decoupled Clock Model from triple to quadruple frequency measurements for BeiDou-3 constellation. Processing of geodetic measurements show overall horizontal positioning errors reduced by 77% (from 20.8 cm to 4.7 cm) and 88% (from 22.8 cm to 2.8 cm) for float and fixed solutions, respectively. Furthermore, this research investigates outliers in epoch-by-epoch PPP solutions, delving into potential causes such as signal-to-noise ratio (SNR), pseudorange multipath and noise etc. Additionally, principal component analysis with Hotelling’s T-squared method is employed to detect major outlier sources. Results indicate that satellite elevation angle, signal strength, and the code-minus-carrier observable, which includes ionospheric refraction and pseudorange multipath, significantly impact positioning solution.
dc.identifier.urihttps://hdl.handle.net/10315/42978
dc.languageen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectGeographic information science and geodesy
dc.subject.keywordsGlobal Navigation Satellite System
dc.subject.keywordsPrecise Point Positioning
dc.subject.keywordsMulti-Constellation
dc.subject.keywordsMulti-Frequency
dc.subject.keywordsAmbiguity Resolution
dc.subject.keywordsPrincipal Component Analysis
dc.subject.keywordsDecoupled Clock Model
dc.titleRobust, Multi-Constellation, Multi-Frequency Precise Point Positioning For Instantaneous cm-level Positioning
dc.typeElectronic Thesis or Dissertation

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