Performance Evaluation and Analysis of a Hybrid Version of a Software Defined GPS/Galileo GNSS Receiver for Dynamic Scenarios

A. Constantinescu, R.Jr. Landry and I. Ilie

Abstract:	This work presents an analysis of the performance improvements of the GPS/Galileo satellite navigation system using a Global Navigation Satellite System (GNSS) software simulator. The generic simulator includes the entire satellite communication system, from the satellite constellations (24 GPS and 27 Galileo satellites), disturbance channel, up to the GPS/Galileo receiver. The Galileo satellite constellation will at least double the number of the existing GPS navigation satellites. The increased number of satellites will improve the robustness of the actual GPS satellite navigation system and will minimize also the lack of visibility of satellites in urban canyons. An important part of this work is the analysis and the evaluation of the positioning errors obtained for two different receiver dynamic scenarios with the GPS, Galileo and the combined GPS/Galileo satellite navigation systems. Moreover, it is desirable to simulate the improvement brought by the Galileo navigation system on the existing GPS performances, by considering a variety of dynamic scenarios, at different latitudes on Earth and for different elevation masks. Precision performances of GPS, Galileo and GPS/Galileo receivers are evaluated, compared and analyzed. The GNSS software simulator considered may use almanac information to determine satellite availability at different locations and at different instants. Positioning errors obtained with only GPS and only Galileo navigation systems are evaluated and compared to the ones obtained with the combined GPS/Galileo navigation system. The simulation results show a positioning improvement by using the hybrid receiver (both GPS and Galileo constellations) in both dynamic scenarios considered in this paper. The use of the hybrid GPS/Galileo system improves the positioning error of at least 21% compared to only GPS and 42% compared to only Galileo. Analyses are performed with respect to visibility, Horizontal Dilution of Precision (HDOP) and Vertical Dilution of Precision (VDOP) parameters in order to obtain a better understanding of the results obtained from the position estimates.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	2697 - 2708
Cite this article:	Constantinescu, A., Landry, R.Jr., Ilie, I., "Performance Evaluation and Analysis of a Hybrid Version of a Software Defined GPS/Galileo GNSS Receiver for Dynamic Scenarios," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 2697-2708.
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