| US 7,486,717 B2 | ||
| Method and device for demodulating Galileo alternate binary offset carrier (Alt-BOC) signals | ||
| Wim De Wilde, Kessel-Lo (Belgium); Jean-Marie Sleewaegen, Jette (Belgium); and Gonzalo Seco Granados, Barcelona (Spain) | ||
| Assigned to European Space Agency, Paris (France) | ||
| Filed on Mar. 01, 2007, as Appl. No. 11/680,851. | ||
| Application 11/680851 is a continuation of application No. PCT/EP2004/009952, filed on Sep. 07, 2004. | ||
| Prior Publication US 2007/0201537 A1, Aug. 30, 2007 | ||
| Int. Cl. H04B 1/707 (2006.01); H03D 3/00 (2006.01); H04L 27/06 (2006.01) | ||
| U.S. Cl. 375—150 [375/322; 375/343] | 11 Claims |
| 1. A method for demodulating alternate binary offset carrier signals comprising at least two subcarriers each having an in-phase
and a quadrature component modulated by pseudo-random codes, the quadrature components being modulated by dataless pilot signals,
the in-phase components being modulated by data signals, the method comprising:
converting the alternate binary offset carrier signals into an intermediate frequency, band-pass filtering the converted signals
and sampling the filtered signals;
generating a carrier phase and carrier phase-rotating the sampled signals by the carrier phase;
correlating the rotated sampled signals; and
generating, for each subcarrier, pseudo-random binary codes and a subcarrier phase, which are used to correlate the rotated
sampled signals.
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