Acoustic detection device

Details Acoustic detection device Acoustic detection device

1990-04-13

1991-05-07

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

G01S 380

Patent

active

050142500

ABSTRACT:
A sonar system has k acoustic detectors (1) for the detection and conversion of acoustic signals into electrical signals s(k), a beamforming unit (3), a frequency analysis unit (4), which uses the signals s(k) to generate signals s(.phi..sub.i, f.sub.j), representing acoustic signals with n frequencies f.sub.j (j=1 . . . n) received from m beam reception directions .phi..sub.i (i=1 . . . m), and a data processing unit (5). The data processing unit (5) comprises a direction estimator unit (6) which generates, for each of the n frequencies f.sub.j on the basis of at least a selection of the signals s(.phi..sub.i,f.sub.j), a narrowband estimator .OMEGA..sub.NB (f.sub.j) of a direction .OMEGA. of an acoustic source, and subsequently on a selection of these .OMEGA..sub.NB (f.sub.j) a broadband estimator .OMEGA..sub.BB.

REFERENCES:
patent: 4207624 (1980-06-01), Dentino et al.
patent: 4754282 (1988-06-01), Edelblute et al.

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