Integrity for Advanced Precise Positioning Applications

Miguel M. Romay Merino, Maria D. Lainez

Abstract:	This paper is aimed at laying down a general integrity concept for the PPP solutions, following a practical service oriented approximation. With this we mean that we are going to focus neither on the system integrity nor on the integrity at user level only, but on the most favorable combination of significant indicators we can assess. PPP accuracy performances are about 5 to 10 centimeters after a 15 to 30 minutes convergence period, and our target is being able to ensure protection levels in the 0.5 to 1 meters range. We will use magicPPP, our in-house developed PPP platform, for performing accuracy versus integrity analyses. We will detect and study different failure modes. We will pay particular attention to cases in which the PPP solution exceeds the expected accuracy bounds (in the centimeter magnitude order), and will try to correlate them with indicators either at system or at user levels which can be considered to be significant from the point of view of the integrity. With these activities we intend to lay down the foundations for an upper-level PPP applicable integrity concept to be refined in subsequent steps, but always closely linked to the final user perspective. There is now a really strong demand for high precision GNSS based applications and services which will keep on increasing in the following years, and our objective is to achieve the challenging task of enabling all these present and future GNSS requested uses, those involving high positioning accuracy, as well as those in which integrity is required. It is not the objective of this paper to completely define a new integrity algorithm for PPP but to assess the feasibility of such an algorithm and to define the general aspects to be considered. We will try to exploit the strong relationship between high accuracy and integrity trying to take advantages of the fact that PPP algorithms rely on strong physical fundaments.
Published in:	Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012) September 17 - 21, 2012 Nashville Convention Center, Nashville, Tennessee Nashville, TN
Pages:	2742 - 2758
Cite this article:	Merino, Miguel M. Romay, Lainez, Maria D., "Integrity for Advanced Precise Positioning Applications," Proceedings of the 25th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2012), Nashville, TN, September 2012, pp. 2742-2758.
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