Acoustic fence

Details Acoustic fence Acoustic fence

2007-07-17

2007-07-17

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

Responsive to intruder energy

C367S131000, C340S541000, C340S566000

Reexamination Certificate

active

10967953

ABSTRACT:
Methods and apparatus determine if an underwater intruder passes under a protective boundary. A sonar sensor system comprises a plurality of sonar sensor modules that are spaced on a protective boundary. A sonar sensor module comprises a sonar transducer (sonar array) that is characterized by an omni-directional radiation pattern that may overlap an omni-directional radiation pattern of an adjacent sonar sensor module transducer. The sonar sensor module collects sonar data such as range information of the target in relation to time. A central processor obtains the sonar data from each sonar module through a telemetry link. The central processor processes the sonar data from the plurality of sonar sensor modules in order to determine an estimated path of the target and may determine if the target should be considered as a threatening underwater intruder from a calculated threat level estimate based on this data.

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