Measuring GALILEO‘s Multipath Channel
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One leading point in the choice of the signal format for the Galileo System is the multipath
transmission channel. Studies concerning the signal structure (e.g. ESA Signal Design Study)
[1] had clearly shown that the synchronisation performance of a specific signal strongly
depends on the reflections in the environment. Especially, short delayed reflections
significantly decrease the performance of the receiver. The positioning error becomes even
worse if these reflections are strong and slowly varying over time, which is predominant in
pedestrian applications. Although narrowband channels like GSM (COST 207) [2] or UMTS
have been measured in the past, it became necessary to analyse the wideband navigation
channel to minimize multipath effects in future highly accurate receivers. For these reasons
we measured the channel from the satellite to a receiver in critical urban and suburban
scenarios. This paper will present first preliminary statements and conclusions for typical
applications.
[1] Andreas Lehner,et al. The Influence of Multipath on the Positioning Error , 2003 .
[2] Andreas Lehner,et al. Characteristics of the Land Mobile Navigation Channel for Pedestrian Applications , 2003 .