Interoperability Between GPS and Galileo

Suman Ganguly, Aleksandar Jovancevic and Joseph Noronha

Abstract:	Similarities between the Galileo and some GPS signals occupying the same band raise serious questions about the interoperability between the two systems. Analytical investigation about the spectral occupancy, code correlations etc. provide excellent first order assessment of the problem. More through performance estimation can be performed using simulated signals and simulated receivers with realistic architectures and under diverse conditions. This approach allows the effect of Dynamics, Obscurations and other interferers or jammers to be estimated for different receiver configurations. Center for Remote Sensing has developed signal generators for all Galileo and GPS signals using a software toolset. This toolset allows for high fidelity signal generation under various scenarios. Based on the information available about the current state of Galileo signal structure, we have developed receiver systems for Galileo signals to evaluate their performance under different signal conditions and for different user dynamics. The interoperability study between the current and future GPS signals with those of Galileo involves assessing various aspects of receiver operation. This paper presents the analysis of the mutual interference between signals, issues regarding the front-end bandwidth and tracking loop and pseudorange measurement degradation. The software toolset allows these issues to be analyzed accurately and efficiently. We present the results of these analyses describing the effects of different proposed Galileo signals on GPS and vice-versa.
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:	670 - 680
Cite this article:	Ganguly, Suman, Jovancevic, Aleksandar, Noronha, Joseph, "Interoperability Between GPS and Galileo," 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. 670-680.
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