Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-03-01
2009-02-03
Vo, Don N (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S322000, C375S343000
Reexamination Certificate
active
07486717
ABSTRACT:
A method for demodulating alternate binary offset carrier signals includes at least two subcarriers, each having an in-phase and a quadrature component modulated by pseudo-random codes. The quadrature components are modulated by dataless pilot signals. The in-phase components are modulated by data signals. The method includes 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.
REFERENCES:
patent: 6922167 (2005-07-01), Gerein
Dovis, F. et al.; SDR Technology Applied to Galileo Receivers; Proceedings of the Institute of Navigation (ION) GPS (2002), Portland, Oregon; Sep. 24, 2002; 2566-2575.
Soellner, M. et al.; Comparison of AWGN Code Tracking Accuracy for Alternative-BOC, Complex-LOC and Complex-BOC modulation options in Galileo E5-band; GNSS 2003, the European Navigation Conference (2003), Graz, Austria; Apr. 22, 2003.
Hegarty, C.J. et al.; Evaluation of Proposed Signal Structure for the New Civil GPS Signal at 1176.45 MHz; MITRE Technical Report; Jun. 1999; 1-27.
Hein, G.W. et al.; Status of Galileo Frequency and Signal Design; Proceedings of the Institute of Navigation (ION) GPS (2002), Portland, Oregon; Sep. 24, 2002; 266-277.
Ries, L. et al.; A Software Simulation Tool for GNSS2 BOC Signals Analysis; Proceedings of the Institute of Navigation (ION) GPS (2002), Portland, Oregon; Sep. 24, 2002; 2225-2239.
De Wilde Wim
Granados Gonzalo Seco
Sleewaegen Jean-Marie
European Space Agency
Panitch Schwarze Belisario & Nadel LLP
Vo Don N
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