Measuring GALILEO‘s Multipath Channel

Abstract

One leading point in the choice of the signal format for the Galileo System is the multipath
\ntransmission channel. Studies concerning the signal structure (e.g. ESA Signal Design Study)
\n[1] had clearly shown that the synchronisation performance of a specific signal strongly
\ndepends on the reflections in the environment. Especially, short delayed reflections
\nsignificantly decrease the performance of the receiver. The positioning error becomes even
\nworse if these reflections are strong and slowly varying over time, which is predominant in
\npedestrian applications. Although narrowband channels like GSM (COST 207) [2] or UMTS
\nhave been measured in the past, it became necessary to analyse the wideband navigation
\nchannel to minimize multipath effects in future highly accurate receivers. For these reasons
\nwe measured the channel from the satellite to a receiver in critical urban and suburban
\nscenarios. This paper will present first preliminary statements and conclusions for typical
\napplications.