Precise Point Positioning Augmentation for Various Grades of Global Navigation Satellite System Hardware

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dc.contributor.advisorBisnath, Sunil B.
dc.contributor.authorAggrey, John Egyir
dc.date.accessioned2020-05-11T12:53:58Z
dc.date.available2020-05-11T12:53:58Z
dc.date.copyright2019-10
dc.date.issued2020-05-11
dc.date.updated2020-05-11T12:53:58Z
dc.degree.disciplineEarth & Space Science
dc.degree.levelDoctoral
dc.degree.namePhD - Doctor of Philosophy
dc.description.abstractThe next generation of low-cost, dual-frequency, multi-constellation GNSS receivers, boards, chips and antennas are now quickly entering the market, offering to disrupt portions of the precise GNSS positioning industry with much lower cost hardware and promising to provide precise positioning to a wide range of consumers. The presented work provides a timely, novel and thorough investigation into the positioning performance promise. A systematic and rigorous set of experiments has been carried-out, collecting measurements from a wide array of low-cost, dual-frequency, multi-constellation GNSS boards, chips and antennas introduced in late 2018 and early 2019. These sensors range from dual-frequency, multi-constellation chips in smartphones to stand-alone chips and boards. In order to be comprehensive and realistic, these experiments were conducted in a number of static and kinematic benign, typical, suburban and urban environments. In terms of processing raw measurements from these sensors, the Precise Point Positioning (PPP) GNSS measurement processing mode was used. PPP has become the defacto GNSS positioning and navigation technique for scientific and engineering applications that require dm- to cm-level positioning in remote areas with few obstructions and provides for very efficient worldwide, wide-array augmentation corrections. To enhance solution accuracy, novel contributions were made through atmospheric constraints and the use of dual- and triple-frequency measurements to significantly reduce PPP convergence period. Applying PPP correction augmentations to smartphones and recently released low-cost equipment, novel analyses were made with significantly improved solution accuracy. Significant customization to the York-PPP GNSS measurement processing engine was necessary, especially in the quality control and residual analysis functions, in order to successfully process these datasets. Results for new smartphone sensors show positioning performance is typically at the few dm-level with a convergence period of approximately 40 minutes, which is 1 to 2 orders of magnitude better than standard point positioning. The GNSS chips and boards combined with higher-quality antennas produce positioning performance approaching geodetic quality. Under ideal conditions, carrier-phase ambiguities are resolvable. The results presented show a novel perspective and are very promising for the use of PPP (as well as RTK) in next-generation GNSS sensors for various application in smartphones, autonomous vehicles, Internet of things (IoT), etc.
dc.identifier.urihttps://hdl.handle.net/10315/37467
dc.languageen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectComputer engineering
dc.subject.keywordsGNSS
dc.subject.keywordsPrecise Point Positioning
dc.subject.keywordsPositioning
dc.subject.keywordsNavigation
dc.subject.keywordsSmartphones
dc.subject.keywordsLow-cost
dc.subject.keywordsGeodesy
dc.subject.keywordsGeomatics
dc.subject.keywordsAugmentation
dc.subject.keywordsGPS
dc.subject.keywordsGLONASS
dc.subject.keywordsGalileo
dc.subject.keywordsBeiDou
dc.titlePrecise Point Positioning Augmentation for Various Grades of Global Navigation Satellite System Hardware
dc.typeElectronic Thesis or Dissertation

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