Method and apparatus for signal receipt and acquisition

Details Method and apparatus for signal receipt and acquisition Method and apparatus for signal receipt and acquisition

2002-12-13

2010-06-08

Ghayour, Mohammad H (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S316000, C370S210000, C370S320000, C370S342000, C702S077000, C708S403000, C708S404000

Reexamination Certificate

active

07733940

ABSTRACT:
The present invention provides for a method of receiving a signal spread over a frequency range, and in particular a direct sequence spread spectrum signals including the step of employing a Fast Fourier Transform (FFT) in the Doppler search. In particular, the invention relates to the receipt of spread spectrum signals such as those transmitted as part of a GPS system.

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S.M. Spangenberg et al; “Code Acquisition for LEO Satellite Mobile Communication Using a Serial-Parallel Correlator With FFT for Doppler Estimation”, Proceedings of First International Symposium on Communication Systems and Digital Signal Processing, 1998, Proceedings of IST International Symposium on Communications Systems and Digital Signal Processing, Sheffield, UK, Apr. 6-8, 1998, pp. 328-333, vol. 1, XP002230502.
Dillard, G., et al. “Mean-Level Detection in the Frequency Domain”, IEE Proc.—Radar, Sonar & Navigation, vol. 143, No. 5, pp. 307-312 (Oct. 1996).
Spillard, et al. “A Serial-Parallel FFT Correlator for PN Code Acquisition from LEO Satellites”, Spread Spectrum Techniques & Applications, vol. 2, pp. 446-448 (Sep. 1998).

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