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International Journal of Navigation and Observation
Volume 2011 (2011), Article ID 247360, 10 pages
http://dx.doi.org/10.1155/2011/247360
Research Article

Galileo's Problem with PRS or What's in a Phase?

Surrey Space Centre, University of Surrey, Guildford, Surrey GU27XH, UK

Received 6 July 2011; Revised 6 November 2011; Accepted 7 November 2011

Academic Editor: Simonetta Paloscia

Copyright © 2011 M. Stephen Hodgart. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The upcoming Galileo global navigation satellite system has a design problem with the cosine-phased BOCc(15, 2.5) modulation of its Public Regulated Service (PRS A-code). This signal needs far more bandwidth than the available 40.92 MHz. The present signal and system specification cannot be expected to deliver design performance under practical operational conditions (noise, receiver phase distortion, and multipath). There would not have been this problem with sine-phased BOC(15, 2.5).