New Approach for Integrity Bounds Computation Applied to Advanced Precise Positioning Applications

Pedro F. Navarro Madrid, Maria D. Laínez Samper, Miguel M. Romay Merino

Peer Reviewed

Abstract:	Precise Point Positioning (PPP) is a consolidated high precision positioning technique providing centimetre-level error. PPP processes dual-frequency pseudorange and carrier-phase measurements from a single user receiver, using detailed physical models and precise GNSS orbit & clock products calculated beforehand. PPP is different from other precise-positioning approaches like RTK in the sense that no reference stations are needed for obtaining the positioning solution. Another advantage of PPP is that since the GNSS orbit & clock products are global, the PPP solutions are global as well. PPP can be applied at post-processing level and also in real-time applications, provided that real-time input orbit and clock data are available. Our GNSS team has developed the algorithms and the data processing infrastructure needed for providing a real-time PPP service. All the required components, from the real time orbit and clock products generation, to the PPP filter implementation and the service management, are under our responsibility. In some previous works, we laid down the foundations for an upper-level reliability concept for PPP, closely linked to the final user perspective, with the aim of providing a certain reliability bound for the required applications. The initial integrity/reliability concept for PPP has now been mathematically rigorously reformulated and is introduced in this paper. The current formulation incorporates all the initially identified relevant indicators, and is expressed as a generalization of the patented IBPL (Isotropy-Based Protection Level) technique to sequential estimation processes. In order to illustrate the excellent bounding capabilities of the new approach for PPP integrity/reliability computation, three different scenarios have been considered: static, kinematic and convergence. Results about the performances of the provided bounds are going to be provided in each one of the considered cases, in terms of protection level magnitude, percentage of integrity failures and safety index versus number of integrity failures.
Published in:	Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015) September 14 - 18, 2015 Tampa Convention Center Tampa, Florida
Pages:	2821 - 2834
Cite this article:	Madrid, Pedro F. Navarro, Samper, Maria D. Laínez, Merino, Miguel M. Romay, "New Approach for Integrity Bounds Computation Applied to Advanced Precise Positioning Applications," Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015), Tampa, Florida, September 2015, pp. 2821-2834.
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