Aspects liés à la résolution des ambiguïtés de phase dans le positionnement ponctuel de précision (PPP) par GPS

Authors: Banville, Simon
Advisor: Santerre, RockCocard, Marc
Abstract: GPS Precise Point Positioning (PPP) still requires long observation sessions in order to achieve cm-level accuracy because ambiguity resolution in point positioning is affected by unmodeled errors and by the presence of receiver and satellite phase biases. In order to gain a better understanding of ambiguity resolution in PPP, an error budget has been made to assess the possibilities of accurate ambiguity fixing. Then, an approach using a GPS simulator has been proposed to calibrate receiver phase biases, and the results show evidence of unmodeled code biases and thermal effects in the receiver. Finally, modifications to the actual calibration methods of satellite phase biases have been suggested to improve compatibility with PPP’s functional model. Residual errors still affect the estimated values and suggestions are made to improve the proposed methodology. The calibration of phase biases is an important issue in achieving instantaneous cm-level point positioning.
Document Type: Mémoire de maîtrise
Issue Date: 2007
Open Access Date: 13 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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