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Controller for marine seismic cable

  • US 4,709,355 A
  • Filed: 06/18/1984
  • Issued: 11/24/1987
  • Est. Priority Date: 06/18/1984
  • Status: Expired due to Term
First Claim
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1. A remotely controlled depth control unit for a marine seismic cable towed behind a ship, the cable being of the type which receives from the ship depth command signals for transmission to the depth control unit for indicating the desired depth for the cable, comprising:

  • (a) a body;

    (b) one or more diving planes moveably connected to the body, the angle of the diving plane with respect to the body controlling the depth of the control unit;

    (c) stored program digital computer means responsive to said depth command signals and to stored depth indicative signals for generating angle control signals;

    (d) springless moving means responsive to the angle control signals for moving said one or more diving planes to move the control unit to said desired depth;

    (e) a depth sensor for providing to a storage means depth indicative signals representative of control unit depth; and

    (f) storage means for storing the depth indicative signals and providing stored depth indicative signals to the computer means,wherein the digital computer means includes means coupled to the moving means for generating a diving plane angle signal directly proportional to said diving plane angle, a stored program digital processor, and means coupling said diving plane angle signal to said digital processor whereby closed loop feedback control of said diving planes is provided for generating said angle control signals.

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