Sonar arrangements

Details Sonar arrangements Sonar arrangements

1982-09-23

1985-06-25

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With beam steering, scanning, or focussing

367905, G01S 382

Patent

active

045258163

ABSTRACT:
A sonar beam steering arrangement in which a circular array of electroacoustic transducers are sampled in sequence, the samples being digitized and stored serially in a shift register. The register is several cycles long so that samples from all of the `illuminated` transducers can be stored simultaneously. The various stages have resistance tappings of different values such that a linear broadside array is simulated for a particular transducer at a particular stage in the shift register cycle. As the samples progress through the register each transducer in turn acquires this simulated broadside array and thus provides a narrow beam 360.degree. scan. Interpolation between adjacent transducer `dead-ahead` direction is obtained by (e.g.) triplicating the shift register and adjusting the weightings slightly from each register to the next.

REFERENCES:
patent: 3370267 (1968-02-01), Barry
patent: 3852707 (1974-12-01), Autrey
patent: 4003016 (1977-01-01), Remley
patent: 4060792 (1977-11-01), van Heyningen
patent: 4233678 (1980-11-01), Grady
patent: 4301522 (1981-11-01), Guyot et al.

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