Automatically tracking scanning sonar

Details Automatically tracking scanning sonar Automatically tracking scanning sonar

2005-03-22

2005-03-22

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

C367S088000, C367S103000

Reexamination Certificate

active

06870793

ABSTRACT:
An automatically tracking scanning sonar alternately performs horizontal scanning and vertical scanning and a target lock processor calculates a predicted position of a target based on an echo signal previously received from the target when the echo signal from the target is interrupted. A selector sets a range, tilt angle and sounding direction and outputs them to a transmit-receive controller such that the scanning sonar can scan the predicted target position. As the depth of the target is determined by performing the vertical scanning, the tilt angle of an umbrellalike beam pattern produced by the horizontal scanning can be varied to follow the target by controlling the tilt angle based on target depth information even when the target moves in vertical directions. It is therefore possible to automatically track the target in a reliable fashion.

REFERENCES:
patent: 4935906 (1990-06-01), Baker et al.
patent: 5148412 (1992-09-01), Suggs
patent: 6084827 (2000-07-01), Johnson et al.
patent: 6192006 (2001-02-01), Iino et al.
patent: 357026770 (1982-02-01), None
patent: 10-90411 (1998-04-01), None
Patent Abstracts of Japan, Pub. No. 05-232225, Sep. 7, 1993.

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