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Assessment on the use of S-Band for combined navigation and communication

: Soualle, F.; Bey, T.; Floch, J-J.; Hurd, D.; Notter, M.; Mathew, C.; Mattos, P.; Mongredien, C.

24th International Technical Meeting of the Satellite Division of the Institute of Navigation, ION GNSS 2011. Vol.1
Red Hook, NY: Curran, 2011
ISBN: 978-1-61839-475-0
International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS) <24, 2011, Portland/Or.>
Conference Paper
Fraunhofer IIS ()

This paper summarizes the outcomes of an almost two-year activity investigating the feasibility of satellite navigation in the frequency band [2483.5-2500] MHz, as one possible evolution of the current Galileo system. It will first present the different systems sharing this band, and show how they can represent either a threat as potential interfering sources or an opportunity for a merge between navigation and communication services or between different navigation systems. Then different options of signal structures, each dedicated to a specific type of interoperability, will be described with a focus on the spreading code structures, the signal waveforms and the multiplexing schemes. A detailed bottom-up link budget starting from a minimal (C/No) of 27 dB-Hz will enable to deduce the required EIRP transmitted by the satellite. This budget will be repeated for three receiver types, looking for different levels of navigation and communication convergence. The final part will show how a Galileo IOV satellite could implement an additional S-band payload, based on information from public domain. The main conclusion is that satellite navigation can be proposed in S-Band, except in regions close to the emitters for fixed or mobiles services where the performances might be severely degraded if not totally annihilated (see [1]). Then, the interoperability with the mobile satellite system, Globalstar, or with the Indian navigation system, IRNSS, appear as the two most promising options. Here, the Prolate Spheroidal Waveform Functions (PSWF) could represent a good compromise between signal interoperability and ranging performances when considering the relative narrow bandwidth of 16.5 MHz. Finally it is shown that only the combination of an extension of the Galileo IOV platform together with the improvements of technology to free power, mass and size margins would enable the implementation of an additional S-Band payload.