Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With towing
Reexamination Certificate
2006-05-30
2006-05-30
Pihulic, Daniel (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With towing
Reexamination Certificate
active
07054229
ABSTRACT:
An acoustic array comprising a plurality of nodes attached to two or more lines. Some or all of the nodes include an emitting transducer and a receiving hydrophone, and the balance include only a receiving hydrophone. Each emitting transducer has associated electronics comprising a high fidelity amplifier and a stored waveform input to the operational amplifier to drive the amplifier, the output of the amplifier exciting the transducer to emit a chirp having a hyperbolic frequency modulated (HFM) waveform. The frequency spectrum of the HFM chirp lies well below the resonant frequency of the transducer. The chirp emitted by a transducer in the node is received and processed by hydrophones in other nodes with a high fidelity representation of the chirp in a cross-correlation operation. Detected chirps are used to determine a range between the emitting and receiving nodes and a shape measurement of the array.
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Allensworth Walter S.
Kitchin David A.
Fasulo, II Albert J.
Pihulic Daniel
The Johns Hopkins University
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