Beamformer

Details Beamformer Beamformer

1978-01-27

1979-10-09

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

343113R, 367123, 367103, G01S 380, G01S 300

Patent

active

041707664

ABSTRACT:
A beamformer forms a beam from a set of samples of signals from an array of elements such as sonar transducers. Sequences of signal samples from each transducer are delayed relative to each other by fractional amounts of the intersample interval. The sequences of the signal samples with the predetermined delays therebetween are applied to a common beamforming filter having a pass band of sufficient width to accommodate the signals. The impulse response time of the filter is longer than the intersample interval in any one of the sample sequences for providing a beam equal to the sum of regenerated transducer signals. The radiation pattern of the beam is independent of the sampling rate.

REFERENCES:
patent: 3356989 (1967-12-01), Autrey
patent: 3594718 (1971-07-01), Black
patent: 3873958 (1975-03-01), Whitehouse
patent: 4060792 (1977-11-01), VAN Heyningen
M. A. Jack et al., Electronics Letters, vol. 13, No. 3, pp. 65-66, Feb. 1977.
V. C. Anderson, J. of the Acous. Soc. of Amer., Jul. 1960, pp. 867-870.

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