Beam-former for FFT-based signal processor

Details Beam-former for FFT-based signal processor Beam-former for FFT-based signal processor

1978-11-20

1980-07-08

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

367123, 343100SA, 343 5FT, G01S 380

Patent

active

042120845

ABSTRACT:
A beam-former for sampling and digitizing a sonar signal preparatory to F Fourier Transformer (FFT) processing comprising an array of ceramic sensors forming a series of rows and columns, a sampling transformer for each row and each column for sampling the weighted sum of the signals from the sensors in each row or column, a log compressor for each sampling transformer for compressing the amplitude of the sampled signal, an analog-to-digital (A/D) converter circuit following each log compressor for sampling and digitizing the compressed signals under the control of a counting circuit so that the log compressor outputs are sampled at prescribed times in relation to each other so as to impart a time or phase shift to the digitized outputs to effect a beam tilting, a decompression circuit for decompressing the time shifted signals, an accumulator for adding the samples from each row and column, and a shifting circuit for shifting the accumulated signal up or down to make it compatible with the FFT circuit.

REFERENCES:
patent: 4107685 (1978-08-01), Martin et al.
patent: 4112430 (1978-09-01), Ladstatter

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