Method and apparatus for detecting submarines

Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type

Reexamination Certificate

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Reexamination Certificate

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10542881

ABSTRACT:
A method for detecting, tracking and locating submarines (24) utilizes pulsed coherent radiation from a laser (12) that is projected down through a water column, with particles in the water producing speckle from backscatter of the random particle distribution, with correlation of two closely time-spaced particle-based speckle patterns providing an intensity measurement indicative of the presence of a submarine. Subsurface submarine movement provides a subsurface wake which causes movement of particles such that two closely-spaced “snapshots” of the returns from particles in the same water column can detect particle movement due to the wake. The magnitude of the speckle pattern change indicates particle movement. In one embodiment, the return signals are imaged onto an intensified CCD or APA array that capture two successive laser pulses through the utilization of dual pixel registered cameras. Note that in the subject system, phase information is converted to measurable intensity information relating to particle motion.

REFERENCES:
patent: 3604803 (1971-09-01), Kahn
patent: 4867558 (1989-09-01), Leonard et al.
patent: 4867564 (1989-09-01), Sweeney et al.
patent: 4893924 (1990-01-01), Leonard et al.
patent: 5270780 (1993-12-01), Moran et al.
patent: 5504719 (1996-04-01), Jacobs
patent: 2006/0083111 (2006-04-01), Grasso

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