Cascaded shift register beamformer

Details Cascaded shift register beamformer Cascaded shift register beamformer

1983-06-24

1996-06-25

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

With beam steering, scanning, or focussing

G01S 382

Patent

active

055306810

ABSTRACT:
Charge coupled shift registers for sonar beamforming provide many channels of high resolution large delays by the cascading of two registers. Two equivalent embodiments are disclosed. In one embodiment the shift rate of the input shift register is an integer multiple "m" of the shift rate of the output shift register which is responsive to every m th signal presented to it. The other embodiment samples the signal in the input register by selected m th pulses of a pulse train whose frequency is m times the shift frequency of the output register. Each embodiment preserves the higher resolution phase information and incremental delay of the higher frequency sampling of the input shift register. The long time delay is provided by the output shift register operating at the lower shift rate.

REFERENCES:
patent: 4149128 (1979-04-01), White
patent: 4152678 (1979-05-01), Shott et al.
patent: 4253168 (1981-02-01), Petrosky et al.
patent: 4288764 (1981-09-01), Ong
Inter. Electron Devices Meeting (Technical Digest) Wash., D.C., Dec. 1976, by Sequin, pp. 31-34.
R. D. Melen et al, "CCD Dynamically Focussed Lenses for Ultrasonic Imaging Systems", Proc. 1975 Naval Electron Lab. Center Int. Conf. on the App. of CCD's, pp. 165-171.

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