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Sensors 2016, 16(1), 111;

Galileo: The Added Value for Integrity in Harsh Environments

European Commission, Joint Research Centre (JRC), Institute for the Protection and Security of the Citizen (IPSC), Security Technology Assessment Unit, Via Enrico Fermi 2749, 21027 Ispra (VA), Italy
Piksel Ltd Italian Branch, Via Ernesto Breda 176, 20126 Milano (MI), Italy
Authors to whom correspondence should be addressed.
Academic Editor: Ha Duong Ngo
Received: 18 November 2015 / Revised: 11 January 2016 / Accepted: 13 January 2016 / Published: 16 January 2016
(This article belongs to the Special Issue Sensors for Harsh Environments)
PDF [3373 KB, uploaded 16 January 2016]


A global navigation satellite system (GNSS)-based navigation is a challenging task in a signal-degraded environments where GNSS signals are distorted by multipath and attenuated by fading effects: the navigation solution may be inaccurate or unavailable. A possible approach to improve accuracy and availability is the joint use of measurements from different GNSSs and quality check algorithms; this approach is investigated here using live GPS and Galileo signals. A modified receiver autonomous integrity monitoring (RAIM) algorithm, including geometry and separability checks, is proposed to detect and exclude erroneous measurements: the multi-constellation approach provides redundant measurements, and RAIM exploits them to exclude distorted observations. The synergy between combined GPS/Galileo navigation and RAIM is analyzed using live data; the performance is compared to the accuracy and availability of a GPS-only solution. The tests performed demonstrate that the methods developed are effective techniques for GNSS-based navigation in signal-degraded environments. The joint use of the multi-constellation approach and of modified RAIM algorithms improves the performance of the navigation system in terms of both accuracy and availability. View Full-Text
Keywords: Galileo; multi-constellation; RAIM; protection levels; integrity Galileo; multi-constellation; RAIM; protection levels; integrity

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Borio, D.; Gioia, C. Galileo: The Added Value for Integrity in Harsh Environments. Sensors 2016, 16, 111.

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