Synthetic aperture active underwater imaging system

Details Synthetic aperture active underwater imaging system Synthetic aperture active underwater imaging system

1990-07-05

1991-07-02

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Acoustic image conversion

With memory means

367 7, G03B 4206

Patent

active

050291440

ABSTRACT:
An acoustic receiving array synthesized using a single stationary receiving lement and a rotating target. Echoes from a highly repeatable transmit pulse are digitized and recorded as the target is rotated. Controlled geometry and essentially stationary channel characteristics eliminate the need for adaptive beamforming techniques. Subsequent to acquisition of the desired data set conventional time delay beam-forming and steering techniques for multi-dimensional arrays are used to focus the array at desired locations. Energy level in a time gate is computed and recorded for each image location. Finally a raster image is generated using the thresholded energy levels.

REFERENCES:
patent: 4768156 (1980-08-01), Whitehouse et al.

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