Expendable virtual vertical sensing array

Details Expendable virtual vertical sensing array Expendable virtual vertical sensing array

1990-10-15

1991-08-13

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With beam steering, scanning, or focussing

367124, 367 3, G01S 380, H04B 159

Patent

active

050401572

ABSTRACT:
A method and apparatus of determining the range and depth of a far field underwater target is provided. A multi-sensor device is released into the water from a surface ship or other deploying platform and allowed to exhibit vertical free-fall in the water. Acoustic field, temperature and depth information are received from the multi-sensor device at depth points along the free-fall. The depth points from a virtual vertical aperture. The acoustic field, temperature and depth information at the depth points are inputs of a virtual vertical sensing array used to determine the range with depth of the target.

REFERENCES:
patent: 3982222 (1976-09-01), Urick
patent: 4093934 (1978-06-01), Urick et al.
patent: 4446542 (1984-05-01), Beckerle
Autrey, S. W., "Passive Synthetic Arrays," Journal of Acoust. Soc. of Ame vol. 84, #2, Aug. 1988.
Buchner, H. P., "Use of Calculated Sound Fields and Matched Field Detection to Locate Sound Sources in Shallow Water," J. Acoust. Soc. of Amer., vol. 59, #2, Feb. 1976.

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