GNSS-2/Galileo End-to-End Simulations for Aviation, Urban and Maritime Applications

Veit Oehler, Gunter W. Hein, Bernd Eissfeller and Bjorn Ott

Abstract:	A complete end-to-end GNSS simulator was developed since the last few years. It includes all known error sources starting from satellite dependent errors (orbit, clock) through atmospheric effects to all relevant receiver errors including multipath effects. The handling of various orbits and signal structures provides a complete tool for future system investigations like GNSS-2/Galileo. One of the most extensive part is the multipath simulation. Through 3D models of the complete surroundings including non natural reflectors (e.g. buildings), topography and also the complete user (e.g. aircrafts, cars, ships), an integrated ray-tracing algorithm provides geometrical multipath with variable reflection depth. The effects on the delay lock loop (DLL) and phase lock loop (PLL) are dynamically realized through mathematical models of the receiver loops. Correction data for augmentation can be configured by the user through up to four reference stations with free configurable antenna patterns. For aircraft approach analysis up to CAT-III, Pseudolites are included. A two antenna user receiver is implemented on the aircraft for optimal Pseudolite tracking performance, including lever arm compensation with attitude data. All incoming signals are monitored at the ground within the B-Value concept. An implemented RAIM algorithm at the user processing side provides integrity, availability and continuity statements. The accuracy is monitored by comparison to the known correct user position. A 3D view is implemented for easier analysis. Thus, the complete simulation can be shown as a 3D movie including all parameters (surroundings, user, Pseudolites, reference stations, all incoming rays, ...). The complete simulation of all relevant parameters is most significant, because rare specific events depending on the local area can hardly be registered through approximately expected error distributions. Many simulations have been performed for aviation, urban and maritime scenarios with respect to the achieved RNP-Parameter performance. The aviation component is of specific interest due to the complex local area augmentation scenario that is built up to reach the aviation requirements up to CAT-III.
Published in:	Proceedings of the IAIN World Congress and the 56th Annual Meeting of The Institute of Navigation (2000) June 26 - 28, 2000 The Catamaran Resort Hotel San Diego, CA
Pages:	461 - 468
Cite this article:	Oehler, Veit, Hein, Gunter W., Eissfeller, Bernd, Ott, Bjorn, "GNSS-2/Galileo End-to-End Simulations for Aviation, Urban and Maritime Applications," Proceedings of the IAIN World Congress and the 56th Annual Meeting of The Institute of Navigation (2000), San Diego, CA, June 2000, pp. 461-468.
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