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Wireless shipboard data coupler
| Details |
Inventors: Grosz, Francis; Miles, Ronald; Holland, Clifford R.; Griffin, Sean;
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Examiner: Pham; Chi H.
Assistant Examiner: Wisler; Mark D.
Attorney, Agent or Firm: Stockstill; Charles J., McDonnell; Thomas E.
The wireless shipboard data coupler allows transmission of data through steel ship bulkheads and submarine pressure hulls without the need for special wiring penetrations. Shipboard sensing data with a 1.0 MHz current is injected into the steel plating adjacent to a ships bulkhead, or onto the pressure hull at any penetration providing an electrical path or discontinuity to the opposing side of the bulkhead or pressure hull through the use of copper-plated, threaded electrodes. The injected current flows as a surface, or "skin effect" current between the electrodes and in an indirect, spread, pattern wrapping around the edge of the penetration. This produces a pattern of surface currents on the opposite side of the ships bulkhead or submarine pressure hull. As the injected current is modulated, the data is received on the other side of the bulkhead or pressure hull using coupling loops to sensing the electrical field generated by the surface currents. |
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DETAILED DESCRIPTION One object of this invention is to provide a method and apparatus of transmitting data through a ships bulkhead or pressure hull subject to minimal interference from mechanical noise sources.
Another object of the invention is to transmit the data stream through the ships bulkhead or pressure hull without the need of leaving hatches or watertight doors open without requiring costly installation and removal of special penetrations.
A further object of this invention is to provide a method and apparatus for transmitting a data stream through a ships bulkhead or pressure hull in a manner that installation and removal is simple and quick with minimal refurbishment.
The wireless shipboard data coupler of the invention allows for the transmission of data bit streams through ships bulkheads and pressure hulls without a penetration of the structure.
A transmitter converts the data stream to an electric current that is applied to a multiple of copper-plated steel electrodes attached the structure adjacent to a ships hatchway or watertight door, or onto a vessels pressure hull, at any penetration providing an electrical path or discontinuity to the opposing side of the bulkhead or pressure hull.
This current flows around the hatchway or discontinuity edge to the opposite side of the bulkhead or pressure hull and is there sensed either by an induction coil or sensing electrodes, and is then applied to the input of a receiver.
The receiver filters any responses that are out of the desired bandwidth, amplifies the resultant signal and converts the sensed current into a data bit stream which is applied to a display or recording device for evaluation.
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