Low cost shading for wide sonar beams

Details Low cost shading for wide sonar beams Low cost shading for wide sonar beams

1995-06-20

1997-01-21

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367119, G01S 1500

Patent

active

055965504

ABSTRACT:
A shallow water sonar apparatus and a method of processing outputs from a shallow water sonar array, where the array consists of at most two elements for receiving the acoustic energy from a plurality of directions. The apparatus also includes a beamformer for processing the acoustic energy received by the two elements to produce a tapered beam pattern which approximates a beamformer output from an array including substantially more than two elements. The tapered beam pattern is produced by asymmetrically amplitude shading outputs of the two elements, such that the output of one of the two elements is summed, without shading, with an output of the second element, shaded by a coefficient factor of 0.23.

REFERENCES:
patent: 4291396 (1981-09-01), Martin
patent: 4661938 (1987-04-01), Jones et al.
patent: 5309409 (1994-05-01), Jones et al.
patent: 5436872 (1995-07-01), Gilmour et al.

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