Underwater sound wave direction finding system

Details Underwater sound wave direction finding system Underwater sound wave direction finding system

1975-03-11

1976-08-24

Farley, Richard A.

Communications: electrical

Selective

Having indication or alarm

G01S 380

Patent

active

039769690

ABSTRACT:
In apparatus for determining the direction of impinging sound waves according to the sum/difference principle, by forming a sum signal and two difference signals in a gradient ranging system composed of four omnidirectional piezoelectric hydrophones arranged in two pairs oriented orthogonally to each other, the hydrophones of each pair are conductively connected together to form a loop in which each terminal of each hydrophone is connected by a short circuit connection to a respective terminal of the other hydrophone of the same pair and the sum signal is derived by producing a signal proportional to the sum of the currents in the two loops and integrating such signal with respect to time.

REFERENCES:
patent: 2349370 (1944-05-01), Orner
patent: 3464056 (1969-08-01), Ziehm et al.
patent: 3588797 (1971-06-01), Ziehm et al.

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