Harbor fence

Communications – electrical: acoustic wave systems and devices – Echo systems – Presence or movement only detection

Reexamination Certificate

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Details

C367S136000, C114S24000E, C114S24000E

Reexamination Certificate

active

06980483

ABSTRACT:
Methods and apparatus determine if an intruder passes into a security zone that is associated with a waterfront asset. An embodiment of the invention provides a harbor fence system that is designed to be deployed in water around ships or other waterfront assets to serve as a line-of-demarcation in order to provide protection. The harbor fence system comprises a series of spars that protrude above the water surface and that communicate with a computer with a telemetry subsystem. Each spar contains electronic sensors, e.g. water immersion sensors and accelerometers, and circuitry to detect an intrusion and to communicate the location of the intrusion to a computer control station. Spars may communicate wirelessly and may also be solar powered. Additionally, the embodiment may also determine whether an underwater intruder is passing under a protective boundary, in which the harbor fence system interfaces to an underwater sonar sensor subsystem.

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patent: 4081784 (1978-03-01), Wilson et al.
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patent: 6591774 (2003-07-01), Metherell et al.
patent: 6778469 (2004-08-01), McDonald
patent: 2003/0222778 (2003-12-01), Plesinger
patent: 2111679 (1983-07-01), None
patent: 2111679 (1983-07-01), None
patent: WO 90/01758 (1990-02-01), None

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