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Prediction of phase ambiguity resolution based on signal intensity and geometry

Willi, Daniel ; Skaloud, Jan

In: GPS Solutions, 2015, vol. 19, no. 3, p. 467-474

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    Titre
    • Prediction of phase ambiguity resolution based on signal intensity and geometry
    Auteur
    • Willi, Daniel. Geodetic Engineering Laboratory, Swiss Federal Institute of Technology Lausanne, EPFL ENAC TOPO, Bâtiment GC, Station 18, 1015, Lausanne, Switzerland
    • Skaloud, Jan. Geodetic Engineering Laboratory, Swiss Federal Institute of Technology Lausanne, EPFL ENAC TOPO, Bâtiment GC, Station 18, 1015, Lausanne, Switzerland
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:331765
    Summary
    The goal of this contribution was to develop a reliable quality indicator reflecting the potential success of differential carrier phase ambiguity resolution for kinematic Global Positioning System (GPS). The indicator must be operable without any communication link between the rover and the reference station. Two common existing GPS quality measures are combined: firstly, the SIGMA model, which is a signal intensity-based weighing scheme reflecting the actual signal quality, and secondly, the ambiguity dilution of precision (ADOP), which is an indicator of the geometric strength of a constellation. Together, these two established indicators form the newly developed ADOP+. In the first part of the present work, a calibration is conducted in order to obtain the parameters for the SIGMA model. In the second part, the ADOP+ is derived and implemented. A practical test is performed on a motorcycle in order to validate the concept. The ADOP+ is proven to be meaningful and well performing within the empirical case. It is able to predict the success of phase ambiguity resolution in the majority of situations.