Hydroacoustic ranging system

G - Physics – 01 – V

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G01V 1/38 (2006.01) G01S 1/38 (2006.01) G01S 5/18 (2006.01) G01S 5/22 (2006.01) G01S 5/30 (2006.01) G01S 15/06 (2006.01) G01S 15/74 (2006.01) G01S 15/87 (2006.01) G01V 1/28 (2006.01) G01V 1/36 (2006.01) H04B 1/59 (2006.01)

Patent

CA 2036124

Digital processing systems and methods of hydroacoustic pulse communications in offshore seismic exploration systems provide more efficient surveys with less critical equipment. Thus hydroacoustic transceiver transducers towed in a set of streamers behind a vessel are accurately positioned under variable operation conditions with a geodetic reference point for more efficiently and accurately monitoring echo points for seismically identifying underwater formations. Spacings between transducers are found by calculating from pulse arrival times the transit times of hydroacoustic pulses. Predetermined pulse shapes and carrier frequencies above 40kHz are accurately determined upon receipt by digitally sampling waveshapes to determine shape and timing the reception of identified pulse shapes at transducers which are transmitted from other transducers for computing separations between sending and receiving transducers. Pulse transit time averaging avoids precise synchronization for simpler apparatus. The carrier frequencies and associated high pass filters for received pulses eliminate hydroacoustic noise. The digital pulse sampling and timing techniques simplify communications with associated data processing systems for seismic analysis and provide compact on-location electronic systems coupled to the transducers.

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