GPS and GLONASS RAIM Availability Analysis Over Europe

Günter W. Hein, Jürgen Pielmeier, Theodor Zink and Bernd Eissfeller

Abstract:	The transition from traditional radionavigation to sat-ellite systems via `Supplemental’ to `Sole Means´ navigation service in aviation is based on the ICAO concept of `Required Navigation Performance (RNP)`. Basic-RNAV (B-RNAV) was adopted by the ECAC states as a first intermediate step. B-RNAV (RNP5) enables the continued operation using present naviga-tion equipment without modification of route structures for an interim period. As a prerequisite for further actions the GPS RAIM (“Receiver Autonomous Integrity Monitoring”) Avail-ability over Europe was investigated in detail in con-sideration of the relevant RNP parameters of the dif-ferent phases in flight. The results of the 24 hours long sequence of computations show considerably large areas where no GPS RAIM is possible. The paper discusses the implemented algorithm of RAIM availability, the design of the software and results of various computations, unveiling the relation-ship between satellite visibility, HDOP and RAIM availability and the selected spatial grid and temporal interval resolution. Special emphasis is also put on the results of a GLONASS as well as a combined GPS/GLONASS RAIM availability analysis.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	465 - 474
Cite this article:	Hein, Günter W., Pielmeier, Jürgen, Zink, Theodor, Eissfeller, Bernd, "GPS and GLONASS RAIM Availability Analysis Over Europe," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 465-474.
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