Communications – electrical: acoustic wave systems and devices – Underwater system – Telemetering
Reexamination Certificate
2005-12-27
2005-12-27
Pihulic, Daniel (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Underwater system
Telemetering
Reexamination Certificate
active
06980487
ABSTRACT:
In a digital acoustic transmission device in which a digital sequence (31) is electrically modulated (22) on a carrier cos ωt, the modulated carrier (23) is prefaced with at least two pulse signals (24) of known timing relative to each other and to the modulated digital sequence to provide an output signal (13) for acoustic transmission. The pulse signals indicate to receiver the start of a transmission, and contain Doppler information for resampling the modulated signal prior to demodulation. Where the information sequence is in encoded blocks of equal length, the relationship between successive blocks can be used to update the Doppler information for use with the following block. Channel information can also be derived from the pulse signals and/or blocks for raking the next part of the incoming signal. Preferably the pulse signals have good correlation characteristics. In the embodiments the pulse signals are an immediately successive identical pair of linearly rising chirps.
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Davies Jonathan James
Downer Samuel William
Dunn Shaun Michael
Pointer Stephen Arthur
McDonnell Boehnen & Hulbert & Berghoff LLP
Pihulic Daniel
Qinetiq Limited
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