Evaluation of Filtered Multitone (FMT) Technology for Future Satellite Navigation Use

Andrea Emmanuele, M. Luise, Jong-Hoon Won, Diana Fontanella, Matteo Paonni, Bernd Eissfeller, Francesca Zanier, and Gustavo Lopez-Risueno

Abstract:	This paper will discuss the numerous advantages of using multicarrier signals as a possible option for future GNSS. Multicarrier (MC) signals in fact could be an interesting “new comer” in the fascinating jungle of contenders, for its several degrees of freedom in its design. In particular, the design of Filtered Multitone (FMT) signal is fully investigated with application to satellite navigation, employing its singular characteristics, such as the full spectral flexibility and the limited Out-Of-Band (OOB) emissions. The FMT waveform performance is investigated in Time-Of-Arrival (TOA) estimation in both acquisition and tracking stages. Acquisition performance depends mainly on the autocorrelation function side lobes level, whereas tracking accuracy depends on the second order moment of the spectrum. Power Spectral Density (PSD) and correlation shaping are strictly related, so a trade-off has to be found in this sense. We show how the PSD and the Gabor bandwidth change if different subcarrier power distributions are selected, and in which way the correlation function also changes. Then a comparison is performed between FMT signals and standard waveforms adopted for navigation, in particular bandlimited BOC signals. We use the MCRB computed in the frequency domain as the key performance metric. Finally, the paper presents a preliminary navigation receiver design for MC signals in comparison with the conventional MC signal processing technique adopted for communication purposes. The paper is closed with conclusions and comments on the obtained results and on the possible way forward.
Published in:	Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011) September 20 - 23, 2011 Oregon Convention Center, Portland, Oregon Portland, OR
Pages:	3743 - 3755
Cite this article:	Emmanuele, Andrea, Luise, M., Won, Jong-Hoon, Fontanella, Diana, Paonni, Matteo, Eissfeller, Bernd, Zanier, Francesca, Lopez-Risueno, Gustavo, "Evaluation of Filtered Multitone (FMT) Technology for Future Satellite Navigation Use," Proceedings of the 24th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2011), Portland, OR, September 2011, pp. 3743-3755.
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