Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1998-07-27
1999-03-02
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367149, H04B 1100
Patent
active
058779990
ABSTRACT:
A method and apparatus for discriminating digital data received from a plurality of spatially distinct acoustic sensing nodes of a distributed undersea optical surveillance system. The present invention advantageously employs Code Division Multiplexing (CDM), which is a synchronous variation of Code Division Multiple Access (CDMA), to communicate a plurality of digital data bit-streams from the nodes to a common location remote therefrom. The inventive system generates at the remote location a pseudo-random reference signal that functions as a carrier for communicating sensed acoustic data from the nodes to the remote location. Using the known spatial relationship between the nodes and the remote location and the pseudo-random reference signal, the present invention operatively synchronizes correlators at the remote location to receive and differentiate data from the various individual nodes.
REFERENCES:
patent: 4525818 (1985-07-01), Cielo et al.
patent: 4545253 (1985-10-01), Avicola
patent: 4649529 (1987-03-01), Avicola
patent: 4965732 (1990-10-01), Roy, III et al.
Holt Michael D.
Kane Richard Thomas
Meyer Timothy Scott
Lucent Technologies - Inc.
Pihulic Daniel T.
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