Multi-line towed acoustic array shape measurement unit

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 amp...

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Bibliographische Detailangaben
Hauptverfasser:	ALLENSWORTH WALTER S, KITCHIN DAVID A
Format:	Patent
Sprache:	eng
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES DETECTING MASSES OR OBJECTS DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES GEOPHYSICS GRAVITATIONAL MEASUREMENTS LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING
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Beschreibung
Zusammenfassung:	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.