Telecommunications – Transmitter and receiver at separate stations – Short range rf communication
Patent
1993-05-28
1995-07-25
Pham, Chi H.
Telecommunications
Transmitter and receiver at separate stations
Short range rf communication
324263, 114270, 34087031, H04B 500, G01R 3304, G08C 1902
Patent
active
054370582
ABSTRACT:
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.
REFERENCES:
patent: 2499195 (1950-02-01), McNiven
patent: 3964051 (1976-06-01), Gilstrap, Jr.
patent: 4932006 (1990-06-01), Delignieres
patent: 5241410 (1993-08-01), Streck et al.
patent: 5293400 (1994-03-01), Monod et al.
Grosz et al., Investigation of the Use of Surface Electrical Currents for ort Range Shipboard Data Communications, Tech. Note 268, NOARL, Jun. 92.
Griffin Sean
Grosz Francis
Holland Clifford R.
Miles Ronald
McDonnell Thomas E.
Pham Chi H.
Stockstill Charles J.
The United States of America as represented by the Secretary of
Wisler Mark D.
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