Characterization of GNSS Frequency Diversity for Pseudorange Accuracy Enhancement in Fading Environments

Ranjeeth Kumar Siddakatte, Ali Broumandan, Gérard Lachapelle

Peer Reviewed

Abstract:	Interference of multipath components on original signals results in a composite signal with constructive and destructive variations. This composite signal shows temporal and spatial power fluctuations, a phenomenon known as fading. The characterization and the combination of GPS signals at different frequency bands in a fading environment are not broadly discussed in the literature and is the focus of the paper. Frequency selective fading of GNSS signals in typical propagation channels is discussed herein. The temporal fading of modern L2C and L1 GPS signals is analyzed simultaneously in various fading environments. The frequency diversity reception is characterized in terms of C/N0 fluctuations and correlation coefficients among other metrics. The amount of SNR enhancement obtained from frequency diversity combination is evaluated and compared with the spatial diversity combination. Pseudorange error reduction resulting from diversity combination is also investigated. Results show that up to 50% RMSE reduction is observed during L1 fading based on the data analyzed in an indoor environment.
Published in:	Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015) September 14 - 18, 2015 Tampa Convention Center Tampa, Florida
Pages:	2669 - 2680
Cite this article:	Siddakatte, Ranjeeth Kumar, Broumandan, Ali, Lachapelle, Gérard, "Characterization of GNSS Frequency Diversity for Pseudorange Accuracy Enhancement in Fading Environments," Proceedings of the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2015), Tampa, Florida, September 2015, pp. 2669-2680.
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