PPP for Advanced Precise Positioning Applications, Including Reliability Bound

María D. Laínez Samper, Miguel M. Romay Merino, Guillermo Tobías Gonzáles, David Barba Martí

Abstract:	The PPP technology is able to complement the basic GNSS functionalities for providing an advanced high accurate PNT solution. PPP algorithms use code and phase observations from a dual-frequency receiver, together with precise satellite orbits and clocks, in order to calculate high accurate receiver coordinates and precise clock estimations. Our GNSS team has developed the algorithms and the infrastructure, except for the tracking network, needed for providing a commercial PPP service. We can manage all the required components, from the real time orbit and clock products generation, to the PPP filter implementation and the service provision. As a differentiating feature, we are working on providing a reliability bound, together with accuracy, continuity and availability to our PPP solution, which we think will help widening its applicability range. In this paper we are going to analyze the PPP problem, trying to understand which the essential limitations of the process are. We are going to consider in detail the GNSS constellations geometrical effects and how the quality of the orbit and clock products can affect the accuracy of the provided positioning solution. In addition to that, we are going to anayse the feasibility of providing the users with a dedicated correction built at server level in order to palliate the mentioned effects and we have been able to take one more step in the definition of a reliability bound for PPP. We are working in laying down the foundations for an upper-level reliability concept for PPP, closely linked to the final user perspective. We aim at achieving the challenging task of enabling a wide range of GNSS uses, those involving high positioning accuracy, as well as those in which a certain reliability bound is required.
Published in:	Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014) September 8 - 12, 2014 Tampa Convention Center Tampa, Florida
Pages:	2478 - 2493
Cite this article:	Samper, María D. Laínez, Merino, Miguel M. Romay, Gonzáles, Guillermo Tobías, Martí, David Barba, "PPP for Advanced Precise Positioning Applications, Including Reliability Bound," Proceedings of the 27th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 2478-2493.
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