Sonic direction system

Details Sonic direction system Sonic direction system

1976-04-12

1980-07-15

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Parametric sonar

367105, 343 5SA, G01S 1506

Patent

active

042131952

ABSTRACT:
A system for the determination of the direction of a source of sound in water utilizing the finite amplitude effect. A narrow beam of sonic energy at a frequency higher than that of the source is projected in a direction opposite the direction of the source. A hydrophone receiving beam intercepts the projector beam at a distance from the projector thereof, the distance being sufficient to permit a finite amplitude non-linear interaction of the projector beam energy and the energy of the source via a virtual end-fire array. Cross-modulation products resulting from the non-linear interaction are received by the hydrophone, the precision of measurement being dependent on the directivity pattern of the virtual end-fire array.

REFERENCES:
patent: 3510833 (1970-05-01), Turner
patent: 3613069 (1971-10-01), Cary, Jr. et al.
patent: 3870988 (1975-03-01), Turner
patent: 3882444 (1975-05-01), Robertson
Bellin et al., Journal of the Acoustical Society of America, vol. 34, Aug. 1962, pp. 1051-1054.

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