Beamformer with reduced sampling rate

Details Beamformer with reduced sampling rate Beamformer with reduced sampling rate

1979-12-03

1981-09-15

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With beam steering, scanning, or focussing

343100SA, G01S 382

Patent

active

042901278

ABSTRACT:
A beamformer for an array of sonar transducers, or electromagnetic radiating elements, includes mixers for translating the signals received by the transducers to a lower frequency. The beamformer incorporates delay lines operating at a clock rate which is reduced in proportion to the decrease in frequency. Each delay line provides delays to the signals of corresponding ones of the transducers in accordance with the time of arrival of a wavefront of radiation upon the respective transducers. Phase shifters coupled between the mixers and the delay lines impart phase shifts to the transducer signals proportional to the respective delays to compensate for the lowering of the frequency.

REFERENCES:
patent: 4107685 (1978-08-01), Martin et al.
patent: 4166999 (1979-09-01), Brady

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