G - Physics
01
S
349/25
G01S 15/66 (2006.01) G01S 7/52 (2006.01) G01S 15/00 (2006.01) G10K 11/00 (2006.01) G10K 11/28 (2006.01)
Patent
CA 1167957
ABSTRACT OF DISCLOSURE A sonar survey apparatus comprises a submersible vessel having a structure adapted to receive a towing cable. A sonar signal transmitter is mounted on the structure. At least one acoustic reflector is mounted on the structure and is shaped to produce, in a focussing plane, line foci of acoustic echo signals received from remote positions. A line array of receiver transducers is mounted on the structure in the focussing plane and extends in a line substantially at right angles to the line foci. Each receiver transducer element has an output for providing a signal representative of a focussed echo signal. A processing apparatus accepts the output of each of the receiver transducer elements and has a control input and an output. The processing apparatus is operable in response to a control signal produced by the movement of the vessel relative to a predetermined orientation, to select the output of a receiver transducer element, relating to a predetermined direction, for display. Selection of a different receiver transducer element is thereby effected so that the processing apparatus continues to provide an output relating to the predetermined direction.
371760
Borden Ladner Gervais Llp
Plessey Overseas Limited
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