GNSS … Coordinating the GPS-Galileo-GLONASS Constellations

Clifford W. Kelley, Kenneth F. Davis and Daniel M. Nguyen

Abstract:	Problem: As currently designed the GPS, GLONASS, and Galileo constellation planes will drift in and out of phase with respect to each other due to the earth’s gravitational anomalies. This causes the combined performance to vary from year to year. Solution: First, simulations were run to determine how much variation in performance will occur from year to year to determine if it is worthwhile to coordinate the GPS, Galileo and GLONASS constellations. It was found that at high DOP availabilities and at high mask angles, large variations occur as the constellations go in and out of phase. Various constellation modification options were examined which would produce a coordinated, common rate of right ascension for all of the constellations, which maintains a constant phasing between the constellations over the life of the systems. These modifications produced performance as good as or better than the best performance over the life of the system without coordination. In addition it was found that having all three constellations provided a large improvement in performance over having only two.
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:	2169 - 2183
Cite this article:	Kelley, Clifford W., Davis, Kenneth F., Nguyen, Daniel M., "GNSS … Coordinating the GPS-Galileo-GLONASS Constellations," 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. 2169-2183.
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