Receiver Integrity Monitoring in Case of Multiple Failures

I. Martini, R. Wolf, G.W. Hein

Abstract:	Navigation receivers’ technologies are rapidly evolving with the new GNSS navigation signals available within the near future. To this purpose a central role is played by the integrity receiver capability. In fact the largest part of applications an error in the position determination might represent an excessive risk condition, in particular when human lives are involved. In these systems the integrity monitoring plays a central role. The main example is given by aeronautical applications, where at the present the fulfillment of integrity requirements during different phases of flight is still to be verified. In this context, it is essential for the user to take advantage of Receiver Autonomous Integrity Monitoring (RAIM) techniques. In fact, although regional integrity is provided by space-based augmentation systems (SBAS) like EGNOS, WAAS and MSAS and global integrity information will be transmitted by the European Galileo satellite navigation system in the near future, RAIM is the only technique able to monitor also the receiver local errors. For this reason it is essential in the integrity determination process. It is also highlighted that present RAIM techniques have limitations, which in particular jeopardize the possibility to certify satellite navigation receiver as main or stand alone positioning platform in aeronautical applications for phase of flights CAT. The main limitation is represented by the fact that they protect users only against one single failure affecting a particular satellite range measurement. Multiple failure events are usually assumed to have a very low probability of occurrence. But since in many safety of life applications the occurrence of every failure has very strict requirements in terms of probability of missed detection, the multiple failure events need more attention and cannot be disregarded anymore by RAIM techniques in the future. This paper presents an integrity monitoring technique, performed at receiver level, able to detect particular multiple failure conditions.
Published in:	Proceedings of the 19th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2006) September 26 - 29, 2006 Fort Worth Convention Center Fort Worth, TX
Pages:	2608 - 2620
Cite this article:	Martini, I., Wolf, R., Hein, G.W., "Receiver Integrity Monitoring in Case of Multiple Failures," Proceedings of the 19th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2006), Fort Worth, TX, September 2006, pp. 2608-2620.
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